Windows XP mode

http://windows.microsoft.com/en-us/windows7/install-and-use-windows-xp-mode-in-windows-7

Windows Virtual PC is the latest Microsoft virtualization technology. You can use it to run more than one operating system at the same time on one computer, and to run many productivity applications on a virtual Windows environment, with a single click, directly from a computer running Windows 7.

1. Make sure you're running Windows 7 Professional, Enterprise, or Ultimate. To find out which edition of Windows 7 you're running, click the Start button , right-click Computer, and then click Properties.
2. Find out whether your computer's CPU is capable of hardware-assisted virtualization. To check, download and run theHardware-Assisted Virtualization Detection Tool.
• If you receive the message “This computer is configured with hardware-assisted virtualization,” you can run Windows Virtual PC and Windows XP Mode. See the instructions below.
• If you receive the error message "There is no hardware-assisted virtualization support in the system," your computer's CPU doesn't support hardware-assisted virtualization. You can still use Windows XP Mode by installing an update to Windows 7. See Why am I receiving errors about hardware-assisted virtualization (HAV) when I try to use Windows XP Mode and Windows Virtual PC?. Be aware that XP Mode will run much better if hardware-assisted virtualization can be enabled.
• If you receive an error message saying "Hardware-assisted virtualization is disabled," this means your computer supports hardware-assisted virtualization, but you need to change settings in your computer's basic input/output system (BIOS) to turn on hardware-assisted virtualization. Procedures to turn on virtualization settings in your computer's BIOS vary depending on the BIOS manufacturer. Check the information that came with your computer or go to the computer manufacturer's website.
3. Go to the Windows XP Mode page in Download Center.
4. Under Quick Details, select your language.
5. Click Continue and follow the instructions on the screen to validate your copy of Windows 7.
6. Select a version of Windows XP Mode to install and click Install.
   Note: Windows XPMode_N versions don't include Windows Media Player.
7. Click Run in your browser's message bar, and follow the instructions on the screen.
8. When setup is completed, click Finish.
9. Go to the Windows Virtual PC page in Download Center
10. Under Quick Details, select your language.
11. Click Continue and follow the instructions on the screen to validate your copy of Windows 7.
12. Select a version of Windows Virtual PC to install and click Install.
13. Note: The x64 version works with 64-bit versions of Windows 7. The x86 version works with 32-bit versions of Windows 7. To find out if your PC is running 32- or 64-bit Windows 7, click the Start button , right-click Computer, and then click Properties. 32-bit and 64-bit information appears next to System type.
14. Click Run in your browser's message bar, and follow the instructions on the screen.
15. Click Yes to install Update for Windows (KB958559).
16. If you accept the license terms, click I Accept.
17. After installation is complete, click Restart Now to restart your computer.