Here's how to update to Windows 8.1 depending on the version of Windows you're currently running:
If you're already running Windows 8, you can update to Windows 8.1 in the Windows Store for free. For more info, see Updating to Windows 8.1 from Windows 8.
If you’re running Windows 7, you can buy and download Windows 8.1 using Windows 8.1 Upgrade Assistant. In Upgrade Assistant, you'll have the option to install Windows 8.1 now, later, or using media with an ISO file or a USB flash drive. For more info, see Upgrading to Windows 8.1 from Windows 7.
If you're running Windows Vista or Windows XP, you'll need to perform a clean installation with a DVD. Make sure to review system requirements before buying a DVD. For more info, see Upgrade to Windows 8.1 from Windows Vista or Windows XP.
Some editions of Windows 8 don't support the update to Windows 8.1 from the Windows Store. For more info, see Why can't I find the update in the Store?
If you're updating from Windows RT, see Windows RT 8.1: FAQ.
If you're updating from Windows 8.1 Preview or Windows RT 8.1 Preview, see Update from Windows 8.1 Preview to Windows 8.1.
If you're already running Windows 8, it's free. Go to the Windows Store to update to Windows 8.1.
If you're running a previous version of Windows, you can see current pricing on the Compare and decide webpage or in Upgrade Assistant.
If you're running Windows 8 or Windows 7, the best way to tell if your PC and connected devices are ready for Windows 8.1 is to download and run Windows 8.1 Upgrade Assistant, which scans them and tells you if there is anything you'll need to do before or after updating.
If you're running Windows Vista or Windows XP, you can use Windows 8 Upgrade Assistant to see if your programs and devices are compatible with Windows 8, since most programs and devices that work in Windows 8 will also work in Windows 8.1.
But you should still check the system requirements. We also recommend that you visit your PC manufacturer's website for info about updated drivers and hardware compatibility.
Here is a summary of the system requirements:
Processor: 1 gigahertz (GHz) or faster
1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
Free hard drive space:
16 GB (32-bit) or 20 GB (64-bit)
DirectX 9 graphics device with WDDM driver
If you don't have enough room on your hard drive, you might be able to free up some space. For more info, see Tips for freeing up drive space on your PC.
You need touch input hardware to experience the touch capabilities in Windows 8.1. For more info, see Multi-touch hardware requirements.
If you're running Windows 8, you need 3,000 MB of available space for the 32-bit version of Windows 8.1, and 3,850 MB of available space for the 64-bit version of Windows 8.1. If you're running Windows 7, we recommend that you run Windows 8.1 Upgrade Assistant to check if you have enough available space. If you're running Windows Vista or Windows XP, we recommend you check the system requirements before installing Windows 8.1.
You need a total of 16 GB (32-bit version) or 20 GB (64-bit version) of space on your hard drive for Windows 8.1.
If you start your PC from installation media that you created when you downloaded the ISO, such as a DVD or USB flash drive, you won't be able to keep your apps, Windows settings, or personal files when you install Windows 8.1.
This table shows what you can keep when you update, depending on the version of Windows you currently have running on your PC.
To verify which version of Windows you have now, see Which Windows operating system am I running?
Windows settings, personal files, and most apps
Nothing—you must boot from media and perform a clean installation
Nothing—you must boot from media and perform a clean installation
If you're running Windows 8, your Windows Store apps will need to be reinstalled from the Store. In the Store, swipe down from the top edge of the screen or right-click, tap or click Your apps, select the apps you want to install, and then tap or click Install. You can also reinstall apps from the Start screen by tapping or clicking the tiles.
If you're running Windows 7, Windows Vista, or Windows XP, all of your apps will need to be reinstalled using the original installation discs, or purchase confirmation emails if you bought the apps online.
If you're updating from Windows 8, you can use Windows 8.1 Upgrade Assistant to check your desktop apps and connected devices—most desktop apps, devices (like printers), and network connections will work normally after the update. You'll need to reinstall your Windows Store apps. For more info, see Updating to Windows 8.1 from Windows 8.
If you're running Windows 7, you can use Windows 8.1 Upgrade Assistant to check if your programs and devices are compatible with Windows 8.1. Or, if you're running Windows Vista or Windows XP, you can use Windows 8 Upgrade Assistant to see if your programs and devices are compatible with Windows 8. Most programs and devices that work in Windows 8 will also work in Windows 8.1.
If you have particular desktop apps or devices you're concerned about, you can check their compatibility in the Windows Compatibility Center, or contact the program or device manufacturer. For more info about fixing compatibility problems, see Getting your applications and devices working in Windows 8.1.
No. If you want to install Windows Media Center, you need to add features to Windows 8.1. If you're already running Windows 8 Pro and have Windows Media Center, you won't need to reinstall it after updating to Windows 8.1. For more info, see the Add features webpage.
If you already have third-party DVD playback software in Windows 8, you should be able to keep using it in Windows 8.1. If you're running Windows 7, Windows XP or Windows Vista, you'll need to reinstall it.
If you don't have a third-party app that plays DVDs, or if you currently rely on Windows Media Player for DVD playback, you'll need to download and install a third-party app or install Windows Media Center to play DVDs.
For more info, see the Add features webpage.
The easiest way to change your language is to update to the same language you currently have on your PC, and then add a new language afterwards. For more info, see Adding a language or keyboard.
If you're performing a clean installation of Windows 8.1 with a DVD or USB flash drive, you can change your language in Windows Setup. For more info, see How to perform a clean installation of Windows.
If you're running Windows 8 and have a language pack or a language interface pack (LIP) installed, they'll be removed when you install Windows 8.1.
For more info, go to the reinstall language packs article.
If your PC has a 64-bit capable processor (CPU) but is currently running a 32-bit version of Windows, you can install a 64-bit version of Windows 8.1, but you'll need to buy it as a DVD and perform a clean installation. You won't be able to keep any files, settings, or apps when you update from a 32-bit to a 64-bit version.
Please note that the Windows 8.1 Pro Pack is used to upgrade from Windows 8.1 to Windows 8.1 Pro, and isn't for cross-architecture installs and doesn't include any media. If you want to change architectures, buy Windows 8.1 Pro.
For more info about what service packs are available, see Add features.
You can buy a Windows 8.1 DVD from the Microsoft Store or any other retailer if available in your country or region.
You can also buy it online from the Microsoft Store in Austria, Belgium, Canada, France, Germany, Ireland, Italy, Japan,
Netherlands, Denmark, Finland, Norway, Sweden, Spain, Switzerland, United Kingdom, and
If you want to build your own PC and install Windows 8.1, or want an additional operating system running in either a local virtual machine or separate partition (including a Mac), you can buy the Windows 8.1 products (full version) from a local retailer.
If you're running Windows 8, you'll likely see a periodic notification to update to Windows 8.1. The first time you receive the update notification, you'll have the option to go to the Windows Store where you can begin the process of updating to Windows 8.1. If you dismiss the notification, you'll receive reminders once a week for the first month, and then twice per month until you update.
You won't see the update notification if:
Your PC isn't eligible for the Windows 8.1 update through the Windows Store (such as a PC running an Enterprise version of Windows 8).
You tried to update to Windows 8.1 and had a problem that caused you to roll back to Windows 8.
You haven't installed KB update 2885699 from Windows Update. For more info, see Why can't I find the update in the Store?
If you recently used Add features to Windows 8 to get an edition of Windows with more features, you might see an error message if you immediately try to update to Windows 8.1 in the Windows Store. To solve this problem, you can try clearing the cache for the Store on your PC.
Swipe in from the right edge of the screen, then tap Search.(If you're using a mouse, point to the top-right corner of the screen, move the mouse pointer down, then click Search.)
Enter run in the search box, and then tap or click Run.
Enter wsreset.exe in the Run command and then tap or click OK.
The Windows Store will open after the cache has been cleared.
If you have touch input hardware that isn't specifically designed for Windows 8.1, but is compliant with the Windows Certification Program for Windows 7, you can upgrade to Windows 8.1 and will experience touch responsiveness at least as good as it was on Windows 7. Because Windows 8.1 touch requires a higher degree of responsiveness and precision, Windows 8.1 touch PCs that qualify for the Windows Certification Program provide a much better experience typing on the touch keyboard and using certain features than on Windows 7 PCs. For example, certain Windows 8.1 features and apps won't work on touchscreens that support fewer than five simultaneous touch points.
If you need help installing Windows 8.1, you can contact support.
Your update also comes with 90 days of no-charge support from Microsoft, whether you buy the update as a DVD from a store or as a download from the web. The 90-day period begins after you install and activate Windows 8.1. (Telecom or other access fees might apply.)
If your PC came with Windows 8 you might be able to restore it back to Windows 8 by refreshing your PC. Your personal files won't be affected, but apps that didn't come with the PC will need to be reinstalled.
For more info, see How to refresh, reset or restore your PC.
If you were running Windows 7, Windows Vista, or Windows XP, you'll need to reinstall your previous version of Windows using the recovery or installation media that came with your PC (typically a DVD).
If you don't have recovery media, you might be able to create it before you update from a recovery partition on your PC using software provided by your PC manufacturer. Check the support section of your PC manufacturer's website for more info. After you install Windows 8.1, you won't be able to use the recovery partition on your PC to go back to your previous version of Windows.