Windows 7 Ultimate is the most versatile and powerful edition of Windows 7. It combines remarkable ease of use with the entertainment features of Home Premium and the business capabilities of Professional, including the ability to run many Windows XP business programs in Windows XP Mode. For added security, you can encrypt your data with BitLocker Drive Encryption and BitLocker To Go. And for extra flexibility, you can work in any of 35 languages. Get it all with Windows 7 Ultimate. -Easier to use Simplify your PC with new navigation features like Shake, Jump Lists, and Snap. Customize Windows to look and feel the way you like by changing themes and taskbar programs. Easy to network (with or without a server). Back up your complete system over a network. Help protect data on your PC or portable storage device against loss or theft with BitLocker. -FASTER and more flexible Designed to make your PC Sleep and resume quicker. Takes full advantage of 64-bit PC hardware and memory. Windows XP Mode gives you the business flexibility you need. Switch Between any of 35 languages. -Best PC entertainment experience Watch, pause, ReWind, and record TV with Windows Media Center. Watch your favorite DVD movies. Includes integrated video and Dolby audio codecs. Note: If your computer is running Windows XP, you’re eligible to buy the upgrade version of Windows 7. However, when you upgrade, you’ll need to first back up all of your files to an external drive, and then re-install your applications from the original discs or setup files. For detailed instructions, see Upgrading from Windows XP to Windows 7 (custom installation).