Is My Windows 32-bit or 64-bit? Check, Understand and Switch (Windows 11 and 10)

To check whether Windows is 32-bit or 64-bit, open Settings > System > About and read System type under Device specifications. It says, for example, 64-bit operating system, x64-based processor, or ARM-based processor on Snapdragon PCs. Windows 11 is always 64-bit; there is no 32-bit Windows 11. Windows 10 came in both, and a 32-bit Windows 10 can use only about 4 GB of memory. If System type says 32-bit operating system, x64-based processor, the PC can run 64-bit Windows, but moving to it needs a clean install, using the same license. You can also run msinfo32 or, in PowerShell, (Get-CimInstance Win32_OperatingSystem).OSArchitecture. When downloading software, choose 64-bit or x64 on 64-bit Windows, and ARM64 versions where offered on Arm PCs.

Ethan's aunt asked him to install a program on her old laptop, and the download page offered two versions, 32-bit and 64-bit. He picked 64-bit out of habit, and the installer refused to run. Jake asked him to open the About page. The laptop was running 32-bit Windows 10 on a processor that could have run 64-bit all along, and it was stuck at less than 4 GB of usable memory even though 8 GB was installed. The installer was easy to fix with the other download. The bigger fix, a clean install of 64-bit Windows, doubled the memory the laptop could use and made it noticeably faster. This page explains how to check, what the numbers mean, and when switching is worth it.

What 32-bit and 64-bit mean

The terms describe how much data a processor handles at once and, more importantly for everyday use, how much memory a system can address. A 32-bit system can address about 4 GB of memory in total, and after reserving space for hardware such as graphics, a 32-bit Windows usually shows between 3 and 3.5 GB as usable, no matter how much is installed. A 64-bit system can address vastly more, far beyond what any PC holds today, so the installed memory is what limits you.

There are other differences. 64-bit Windows includes stronger security features, such as mandatory driver signing and better memory protection, and runs 64-bit apps, which can use more memory and are often faster for demanding work like video editing, games and large spreadsheets. 64-bit Windows also runs most 32-bit apps through a built-in compatibility layer called WOW64. 32-bit Windows can only run 32-bit apps, and very old 16-bit programs from the DOS and Windows 3.1 era run only on 32-bit Windows, which is one of the few remaining reasons to keep it.

For almost everyone today, 64-bit is the right choice. Nearly every PC sold in the last fifteen years has a 64-bit capable processor, and modern software increasingly comes only in 64-bit versions.

Why the limit is 4 GB

The 4 GB figure comes from simple arithmetic. A 32-bit system uses 32-bit numbers for memory addresses, and 2 to the power of 32 is 4,294,967,296, so it can point to about 4.29 billion bytes, which is 4 GB. Some of that address space is reserved for hardware such as the graphics card, the BIOS and other devices, which is why 32-bit Windows usually shows only 3 to 3.5 GB usable.

A 64-bit system uses 64-bit addresses, which could in theory point to 16 exabytes, billions of times more than any PC holds. In practice, Windows editions set their own limits, such as 128 GB for Windows 11 Home and 2 TB for Pro, but those are far beyond what most PCs need.

That is also why 64-bit was inevitable once PCs routinely shipped with more than 4 GB, which happened around the time of Windows 7.

Security differences

64-bit Windows is meaningfully more secure than 32-bit. It requires all drivers to be digitally signed, which blocks a whole class of malware that installs malicious drivers. It includes Kernel Patch Protection, which stops software from modifying the core of Windows. Address space layout randomization, which makes attacks harder by placing code at unpredictable memory addresses, is far more effective with 64-bit's huge address space. And hardware-backed protections such as Data Execution Prevention are always on.

Modern Windows security features, such as Memory Integrity, Virtualization-based Security and Credential Guard, need 64-bit Windows and supporting hardware. That is one reason Windows 11 requires 64-bit, and why a 32-bit Windows 10 PC, even with ESU, is less protected than a 64-bit one.

For anyone still on 32-bit Windows for convenience, this security gap is the strongest argument to switch, more than speed or memory.

Check in Settings

1. Open Settings (Windows key + I).
2. Select System, then scroll down and select About.
3. Under Device specifications, find System type.
4. Read the first part for Windows: 64-bit operating system or 32-bit operating system.
5. Read the second part for the processor: x64-based processor, x86-based processor or ARM-based processor.

The same page shows Installed RAM, often with a usable amount in brackets on 32-bit systems, such as 8.00 GB (3.45 GB usable), which is the clearest sign of the 32-bit memory limit. A quick way to open the page is to press Windows key + Pause/Break on keyboards that have that key, or right-click Start and choose System.

On Windows 10, the same information is at Settings > System > About as well, with System type listed under Device specifications in the same way, so these steps work on both versions.

Reading the System type line

Download pages label versions in different ways. x64, AMD64, 64-bit and Win64 all mean the same 64-bit version for Intel and AMD processors, despite AMD in the name. x86, 32-bit and Win32 mean the 32-bit version. ARM64 or Arm means the version for Windows on Arm.

Most PCs in use today show the first row.

Architecture names explained

The naming is confusing for historical reasons. Win32 in particular appears in places that have nothing to do with 32-bit, such as the name of classic desktop apps on 64-bit Windows. When choosing a download, look for an explicit 64-bit, x64 or ARM64 label rather than relying on Win32 or Win64 alone.

When in doubt, the Microsoft Store and winget, the Windows package manager, choose the right architecture automatically, which avoids the question entirely for supported apps.

Other ways to check

System Information gives the same answer with more detail. Press Windows key + R, type msinfo32 and press Enter. In System Summary, System Type shows x64-based PC for 64-bit Intel and AMD systems, x86-based PC for 32-bit, or ARM64-based PC for Arm. The page also lists the processor, BIOS version and installed memory; our guide to finding your BIOS version uses the same tool.

From a command line, systeminfo lists a System Type line, and echo %PROCESSOR_ARCHITECTURE% in Command Prompt prints AMD64, x86 or ARM64. In PowerShell, (Get-CimInstance Win32_OperatingSystem).OSArchitecture returns 64-bit or 32-bit. Older guides suggest the wmic command for this, but WMIC has been removed from recent Windows 11 versions, so use the PowerShell command instead.

File Explorer offers a quick hint too: a 64-bit Windows has two program folders on the system drive, Program Files for 64-bit apps and Program Files (x86) for 32-bit apps, while a 32-bit Windows has only Program Files.

Checking a relative's PC over the phone

When helping someone remotely, the quickest instruction is: press the Windows key, type about, open About your PC, and read me the line that says System type. That works on Windows 10 and 11 and avoids talking someone through menus. Ask for the Installed RAM line too, which tells you whether a 32-bit system is wasting memory.

If they need to download software, tell them which label to look for on the download page, such as 64-bit or x64, before they click. Many download problems with family members come from picking the first button on the page, which is sometimes the wrong version or an advertisement.

Write the answer down for future reference, along with the Windows version from winver, so you do not need to ask again next time you help.

Windows 11 is 64-bit only

Windows 11 has no 32-bit version. Microsoft dropped 32-bit Windows for new releases when Windows 11 launched in 2021, and Windows 11 also requires a supported 64-bit processor from a defined list, which our guides to supported Intel processors and supported AMD processors cover. If you run Windows 11, you are on 64-bit, either x64 for Intel and AMD or ARM64 for Arm processors.

Windows 11 still runs many 32-bit apps through WOW64, so older programs usually keep working. What it cannot run are 32-bit drivers and 16-bit programs, so very old hardware that only has 32-bit drivers will not work on Windows 11.

32-bit apps on Windows 11

Windows 11 still runs 32-bit x86 apps on Intel and AMD PCs through WOW64, the same layer 64-bit Windows 10 uses, so most older 32-bit programs install and run normally. Many popular programs still ship 32-bit versions alongside 64-bit ones for compatibility. On Arm PCs, Windows 11 runs x86 and x64 apps through emulation, but version 24H2 dropped support for apps built for 32-bit Arm, a rare type mostly from the early Windows on Arm era.

If an old 32-bit program misbehaves on Windows 11, try its compatibility settings: right-click the program, choose Properties > Compatibility, and select an older Windows version or run the compatibility troubleshooter. That fixes many issues with old installers and programs.

If compatibility settings do not help, the program's maker may offer a newer version, often as a free or discounted upgrade for existing customers.

This app can't run on your PC

The message This app can't run on your PC, with advice to find a version for your PC, usually means the program was built for a different architecture: a 64-bit installer on 32-bit Windows, or an Arm-only build on an Intel or AMD PC. Check System type, then download the version that matches. If you already have the right version, the file may be damaged or blocked; download it again from the official site.

The same message can appear for very old programs that need 16-bit support, which 64-bit Windows lacks, and for programs blocked by security settings such as Smart App Control. For a 16-bit program, the options are a virtual machine running an old 32-bit Windows, or a modern replacement program.

On Arm PCs, the same message can appear for apps that include drivers or system components, such as some antivirus and VPN products, which need native Arm versions to work.

32-bit Windows 10

Windows 10 was sold in both 32-bit and 64-bit versions, and many budget laptops and tablets from around 2015 to 2018 shipped with 32-bit Windows 10, often with 2 GB of memory and small storage. Some PCs upgraded from 32-bit Windows 7 or 8 also kept 32-bit Windows 10, since the free upgrade kept the same architecture. Those are the PCs most likely to show 32-bit today.

Windows 10 reached end of support in October 2025, and 32-bit Windows 10 cannot be upgraded to Windows 11 at all, because Windows 11 requires 64-bit. Consumer Extended Security Updates cover 32-bit Windows 10 22H2 as well, to October 12, 2027, so these PCs can stay protected for now. Our guide to Windows 10 and 11 support dates explains ESU and the options after it.

If a 32-bit Windows 10 PC is your main computer, plan for its replacement before October 2027, since it has no upgrade path to a supported Windows after ESU ends.

A short history of 32-bit and 64-bit Windows

Windows moved to 64-bit gradually. A 64-bit edition of Windows XP for x64 processors appeared in 2005, but few drivers and programs supported it. Windows Vista and especially Windows 7, from 2009, made 64-bit mainstream, as PCs began shipping with more than 4 GB of memory. For years after, both versions were sold, and many low-cost PCs kept 32-bit to save a little memory on machines with 2 GB or less.

Starting with Windows 10 version 2004 in 2020, Microsoft stopped offering 32-bit Windows 10 to PC makers for new systems, though existing 32-bit installations continued to be supported. Windows 11 completed the move by dropping 32-bit entirely. Other platforms made the same transition: iPhones have run only 64-bit apps since iOS 11 in 2017, Macs dropped 32-bit apps with macOS Catalina in 2019, and Google Play has required 64-bit versions of apps since 2019.

Today, a new PC running 32-bit Windows would be a surprise; the question survives mainly on machines bought a decade ago.

Switch from 32-bit to 64-bit Windows

If System type shows a 32-bit operating system on an x64-based processor, the PC can run 64-bit Windows. There is no in-place upgrade from 32-bit to 64-bit; you need a clean install, which erases the drive. Your Windows license stays valid, because licenses are not tied to 32-bit or 64-bit, and Windows reactivates automatically on the same PC after installation.

1. Back up all files to an external drive or cloud storage, and note the programs you will need to reinstall.
2. Check that drivers for your hardware, especially graphics, Wi-Fi and printers, are available in 64-bit versions from the PC or device maker.
3. On another PC or this one, create 64-bit installation media with Microsoft's Media Creation Tool or an ISO.
4. Restart the PC from the USB drive, usually by pressing a boot menu key such as F12 at startup.
5. Choose a custom installation, delete or format the existing Windows partitions, and install.
6. Sign in, let Windows activate, install updates and drivers, then reinstall your programs and restore your files.

Our guide to downloading Windows ISO files officially covers getting installation media. If the PC meets Windows 11's requirements, consider installing 64-bit Windows 11 directly, which our page on a PC that doesn't meet Windows 11 requirements helps you check.

Processor features 64-bit Windows needs

Being x64-capable is the main requirement, but 64-bit Windows 10 also needs a few processor features that some very early 64-bit chips lacked, including PAE, NX (also called Execute Disable or XD bit), SSE2 and an instruction called CMPXCHG16b. Almost every 64-bit processor from the last fifteen years has them, but on some older PCs NX must be turned on in the BIOS, where it may be listed as Execute Disable Bit or No-Execute Memory Protection.

If 64-bit Windows setup reports that the processor is not supported on a PC that System type says is x64-based, check the BIOS for these options, update the BIOS, and if it still fails, the processor is one of the rare early chips that cannot run current 64-bit Windows.

BIOS updates from the PC maker sometimes add or fix these options on older machines, so installing the latest BIOS is a sensible step before attempting the switch on any PC more than a few years old.

Budget tablets with 32-bit firmware

A group of small, inexpensive Windows tablets and laptops from around 2014 to 2016, many with Intel Atom processors, have 64-bit capable processors but 32-bit UEFI firmware. Standard 64-bit Windows installation media cannot boot on them, so they shipped with 32-bit Windows even though the processor could do more. They also usually have only 1 or 2 GB of memory soldered to the board.

On these devices, switching to 64-bit Windows is impractical and offers little benefit given the small memory. Keep them on 32-bit Windows 10 with ESU for light use until October 2027, or retire them. Lightweight Linux distributions that support 32-bit UEFI booting are another option for enthusiasts.

A quick way to tell if a device is one of these is its age and memory: a small tablet or netbook from that period with 2 GB or less and 32-bit Windows is almost certainly one.

Is switching to 64-bit worth it?

Switching is worth it when the PC has more than 4 GB of memory installed, since 32-bit Windows wastes the rest, or when you need software that only comes in 64-bit, which is increasingly common for browsers, creative tools, games and security software. It is also the only route to Windows 11 on capable hardware.

It may not be worth it on a very old or low-powered PC with 2 GB of memory, where 64-bit Windows uses slightly more memory and offers little benefit, or when you depend on an old program or device that only works on 32-bit. For a PC near the end of its life, the effort of a clean install might be better spent on a replacement or on a lightweight operating system such as a Linux distribution or ChromeOS Flex.

Before you switch: what to check

A clean install goes smoothly when you prepare. Make a list of every program you use and where to download it again, along with license keys for paid software, since a clean install removes them all. Export browser bookmarks and passwords, or make sure browser sync is on. Save email account settings if you use a desktop email program, and check that your files are fully backed up by opening a few from the backup.

Check the PC maker's support page for 64-bit drivers, especially for Wi-Fi, since without a network driver you cannot download the others. Many people download the Wi-Fi and chipset drivers to a USB drive in advance. Finally, set aside an afternoon: installation itself takes under an hour on most PCs, but updates, drivers, programs and files take longer.

If the PC came with Windows preinstalled, also note any recovery partition or maker tools you rely on, since a clean install removes them; most can be downloaded again from the maker's support site.

After switching: getting back to normal

After installing 64-bit Windows, run Windows Update several times until no more updates appear, including optional driver updates. Open Device Manager and look for any devices with warning icons, which need drivers from the maker. Check Settings > System > About to confirm System type now shows a 64-bit operating system and that the full installed memory is usable, then check Settings > System > Activation to confirm Windows is activated.

Reinstall programs from official sites, choosing 64-bit versions, and restore your files from the backup. Set up File History, OneDrive or another backup on the new installation so you are protected from the start. Most people find the PC faster and more responsive afterward, both from the 64-bit change and from the fresh start.

Keep the backup drive untouched for a few weeks afterward, until you are sure nothing was missed in the move.

Virtual machines and 64-bit

Virtual machines let you run another operating system inside Windows, and architecture matters here too. A 64-bit host can run both 32-bit and 64-bit guest systems, provided the processor's virtualization feature, Intel VT-x or AMD-V, is turned on in the BIOS. A 32-bit host generally cannot run 64-bit guests. This is useful if you need an old 32-bit Windows for a legacy program: run it in a virtual machine on a modern 64-bit PC rather than keeping an old PC around.

On Arm PCs, virtual machines run Arm versions of operating systems, so a Windows on Arm PC can run Arm Linux or Windows on Arm guests, but not standard x64 Windows guests at full speed. Keep this in mind if virtual machines are part of your work.

Dual boot and other operating systems

If you dual-boot Windows with Linux, or plan to install Linux on an old PC, architecture matters there too. Most major Linux distributions now offer only 64-bit versions, having dropped 32-bit installers in recent years, so a 32-bit-only processor has few choices left. Distributions for Arm exist too, but Windows on Arm laptops often need specific support for their hardware, so check compatibility before trying.

ChromeOS Flex, which turns older PCs into Chromebook-like machines, requires a 64-bit Intel or AMD processor, so it suits PCs that are 64-bit capable but running 32-bit Windows, a good fit for the aging laptops described on this page.

Check a distribution's requirements page before downloading, since a 64-bit-only installer will not start on a 32-bit-only processor.

Windows on Arm

Some Windows PCs, such as those with Qualcomm Snapdragon processors, including many Copilot+ PCs, use Arm processors instead of Intel or AMD. System type shows 64-bit operating system, ARM-based processor. These PCs run apps built for ARM64 natively, which gives the best speed and battery life, and they run regular x64 and x86 apps through emulation, which Windows 11 calls Prism in recent versions.

Most everyday apps now have ARM64 versions or run well under emulation. When a download page offers an ARM64 version, choose it. Some games with anti-cheat software, older drivers and specialized hardware tools may not work on Arm, so check before buying an Arm PC if you rely on them. Drivers in particular must be built for ARM64; emulation does not cover drivers.

Arm PCs are a good choice for long battery life and quiet operation, and for most people who use a browser, Office and common apps, the architecture difference is invisible. The checks matter mainly for gamers, people with specialized hardware and those who rely on older software.

Drivers and devices

Drivers must match the Windows architecture exactly: 64-bit Windows needs 64-bit drivers, and Windows on Arm needs ARM64 drivers. Unlike apps, drivers cannot run through compatibility layers or emulation. Old printers, scanners, sound cards and specialty devices sometimes have only 32-bit drivers, which is the most common reason people stay on 32-bit Windows.

Before switching to 64-bit or buying an Arm PC, check the device maker's support site for drivers that match. Many common devices, such as printers, work with drivers included in Windows itself, so a missing download is not always a dead end. If a device has no compatible driver, consider replacing it; older devices also tend to stop receiving security fixes.

Windows Update also offers drivers for many devices automatically after installation, so check there first before searching the maker's site, especially for common printers and network adapters.

Is an app 32-bit or 64-bit?

To see whether a running app is 32-bit or 64-bit, open Task Manager with Ctrl + Shift + Esc, go to the Details page, right-click any column heading, choose Select columns, and turn on Platform. Each process then shows 32-bit or 64-bit, or ARM64 on Arm PCs. Our guide to opening Task Manager every way covers the shortcuts.

The install folder gives a clue as well: 64-bit apps usually install to Program Files and 32-bit apps to Program Files (x86). Our page on finding recently installed apps and where they live explains these folders. Many apps also show their architecture in their About or Help dialog, often with the version number.

Games are worth a special note. Most games released in the last decade are 64-bit only, and game platforms increasingly require 64-bit Windows to run at all, so a 32-bit Windows PC is effectively shut out of modern gaming regardless of its graphics card.

Old 32-bit software to watch

Some kinds of software cause most problems when moving to 64-bit. Old accounting and tax programs, especially versions from more than a decade ago, may use 16-bit installers even if the program itself is 32-bit. Office add-ins built for 32-bit Office will not load in 64-bit Office. Printer and scanner utilities from old devices often include 32-bit drivers that will not install. Old games may use copy protection drivers that 64-bit Windows blocks.

Test important old programs before committing to a switch, for example in a virtual machine running 64-bit Windows, or check the maker's site for compatibility notes. For programs that will not work, a newer version, a modern alternative or a virtual machine running an older Windows are the usual solutions.

Keep the original installation files and license details for any old program you depend on, since download links for older versions often disappear.

Choosing the right download

On 64-bit Windows, choose the 64-bit version of software whenever it is offered. It can use more memory, and many developers now treat 32-bit versions as legacy, updating them less or dropping them. Install the 32-bit version only if the software maker recommends it for compatibility, such as some add-ins for older Office setups. On 32-bit Windows, you must choose 32-bit versions, and 64-bit installers will refuse to run, as Ethan found.

Download only from official sites or the Microsoft Store, which picks the right version automatically. Our guide to installing programs on Windows safely covers spotting fake download buttons and bundled extras.

When a download page detects your system automatically, it usually gets it right, but check the label before installing.

Phones, tablets and Macs

Outside Windows, the question has mostly disappeared. iPhones and iPads run only 64-bit apps. Android phones are 64-bit, and many recent models support only 64-bit apps. Macs with Apple silicon use 64-bit Arm processors and run Intel apps through Apple's Rosetta translation. Chromebooks use either Intel, AMD or Arm processors, but apps from the Play Store handle the difference automatically.

The practical takeaway is that 64-bit is the norm everywhere, and the 32-bit question now matters mainly for older Windows PCs and old software.

For households with a mix of devices, the only place worth checking is the Windows PC, and only if it is several years old; everything else has already made the move.

Microsoft Office: 32-bit or 64-bit

Microsoft 365 and recent Office versions install the 64-bit version by default on 64-bit Windows. The 32-bit version remains available for people who rely on older add-ins, macros or tools built only for 32-bit Office. To check which you have, open any Office app, go to File > Account > About and read the line that ends in 32-bit or 64-bit.

Changing from one to the other requires uninstalling Office and reinstalling the other version from your Microsoft account's install options. Most people should use 64-bit, especially with large Excel workbooks, which benefit from the extra memory.

Browsers on 32-bit and 64-bit Windows

Web browsers show the difference most clearly. A modern browser with a handful of tabs, a video and a web app can use several gigabytes of memory, which a 32-bit system simply does not have, leading to tabs reloading, freezes and crashes. On 64-bit Windows, browsers install as 64-bit versions by default, use the full memory and include extra security hardening.

If someone complains that their browser constantly reloads tabs or crashes on an older PC, check System type before anything else. A 32-bit Windows with plenty of installed memory is a common and easily fixed cause, while a 64-bit system with only 4 GB may simply need more memory or fewer open tabs.

Closing unused tabs and removing heavy extensions helps on any system, but no amount of tidying gives a 32-bit browser more than the memory its system can address.

Memory and the 4 GB limit

The 4 GB limit is the most noticeable practical difference. A 32-bit Windows with 8 GB installed still shows only about 3.5 GB usable, and modern browsers with several tabs easily use more than that, so the PC slows down as Windows swaps to disk. Switching to 64-bit makes all installed memory available immediately, with no hardware change.

How much memory you need depends on what you do. For browsing, email and documents, 8 GB is comfortable in 2026; 16 GB suits heavier multitasking, photo editing and gaming; and running AI models locally can need far more, as our page on how much RAM a laptop really needs explains. None of that is possible on 32-bit Windows.

Myths about 32-bit and 64-bit

A common myth is that 64-bit makes everything twice as fast. It does not; the gains come mainly from using more memory and from apps optimized for 64-bit, and everyday tasks on a PC with ample memory feel about the same. Another myth is that 64-bit apps use twice the memory. They use somewhat more, but nothing like double, and the ability to use all installed memory more than makes up for it.

Some people believe 32-bit is better for old, slow PCs. On a PC with 2 GB or less, the difference is small either way, but on anything with 4 GB or more, 64-bit is better. And some think the processor's bit count limits storage size; it does not, since both 32-bit and 64-bit Windows can use large drives, although very old 32-bit systems may struggle with drives over 2 TB because of older partitioning styles.

One more: some believe that 64-bit Windows cannot run on PCs with less than 4 GB of memory. It runs fine on 2 GB for Windows 10 and needs 4 GB for Windows 11, but with so little memory, the benefits of 64-bit are limited and the main advantage becomes security and app compatibility.

Adding memory after switching

Once on 64-bit Windows, adding memory is one of the cheapest ways to speed up an older PC. Check how much the PC has and how many slots are free in Task Manager > Performance > Memory, which shows the total, speed and Slots used, such as 1 of 2. The PC maker's specifications list the maximum memory and the type, such as DDR4 or DDR5.

Many laptops have memory soldered to the board and cannot be upgraded, while most desktops and some laptops have free slots. For a PC that was stuck at 3.5 GB on 32-bit Windows, moving to 64-bit and adding a second memory module can transform its performance for the price of a few dozen dollars.

Buy memory that matches the existing module's type and speed, and install it with the PC unplugged; most desktops take only a few minutes.

What this page said before

The original version of this page, from 2015, explained how to find whether Windows 10 was running in 32-bit or 64-bit for beginners, using the System page. That method still works. This rewrite updates it for Windows 11, which is 64-bit only, and adds the meaning of each System type result, other ways to check, the 4 GB limit, switching from 32-bit to 64-bit, Windows on Arm and choosing the right downloads.

The basic check has not changed in more than a decade, which makes it worth knowing for anyone who helps family and friends with their PCs.

32-bit or 64-bit: frequently asked questions

Ethan's aunt's laptop now runs 64-bit Windows 10, enrolled in ESU, with all 8 GB of its memory in use. Her browser no longer slows to a crawl with a few tabs open, and the program that started it all installed in its 64-bit version without complaint. The fix took an afternoon and cost nothing.

Revision note. Written October 3, 2026, rewriting our 2015 beginner's guide to finding whether Windows runs in 32-bit or 64-bit into a complete guide for Windows 11 and 10, including Arm PCs, switching to 64-bit and choosing downloads. May every installer you run be the right one.