No Windows XP or Vista files or programs will be carried over to Windows 8.1. It is also highly recommended that you back up your files when upgrading. The operating system can be purchased at Microsoft Stores and retailers like Best Buy for $119.99 and $199.99 for the Home and Pro versions, respectively.

Windows XP and Vista users must do a clean install with a DVD copy of Windows 8.1.

Unfortunately, there is no easy path for those of you who have held out from updating to the latest Windows release. Windows settings, personal files, and most apps are saved when going from Windows 8 to 8.1, however only personal files are saved when upgrading from Windows 7.System requirements for Windows 8.1 are as follows: at least a 1GHz processor, 1GB of RAM for the 32-bit version or 2GB of RAM for 64-bit, 16GB of free hard-drive space for 32-bit or 20GB for 64-bit, and a graphics card capable of DirectX 9. Turn on your PC so that Windows starts normally, insert the Windows 8.1 DVD or USB flash drive, and then shut down your PC. The operating system can be purchased online as a digital download or in stores for a physical copy. Windows 8.1 is available for $119.99, while Windows 8.1 Pro can be had for $199.99. Updating to Windows 8.1 from Windows 7 can be done through Microsoft's Upgrade Assistant. Check for any new updates, install them, and restart your system. Next, select Settings, followed by the 'Change PC settings' option, and click on Windows Update. To do this, go back to the Start menu and enter the Charms bar. If this option isn't available, you may have to update your PC to the latest Windows patch. Then, select the large 'Update to Windows 8.1 for free' tile in the Windows Store. If you are not logged into your Microsoft account, enter the Store, go to the Charms menu, select Settings, click the 'Your account' option, and sign in. The Windows 8.1 update requires more than 3GB of space make sure you have enough free space on your hard drive before proceeding. Be sure to back up your personal data and check for any updated drivers before downloading the operating system.

Win dows 8.1 pro