Windows® Virtual PC is a new optional component that you can use to evaluate and migrate to the Windows® 7 operating system while maintaining compatibility with applications that run on older versions of Windows. This component is available as a downloadable update package for Windows 7.

Install :
1) HAV Tool - \havdetectiontool.exe
2) VPC7
\7600.16392.20090912-1334\amd64fre\Windows6.1-KB958559-x64.msu
\7600.16392.20090912-1334\x86fre\Windows6.1-KB958559-x86.msu
3) XP RAIL QFE - \xp\20090820-0027\x86fre\KB961742-v3.exe
4) Vista RAIL QFE - \vista\20090824-0640\x86fre\Windows6.0-KB961741-x86.msu
5) XPM - \vxp\20090908-0855\WindowsXPMode_en-us.exe

If you run Windows XP and want to maintain compatibility with applications that run on that operating system, Windows Virtual PC provides an easy way for you to do this. You can use Windows XP Mode to access a virtualized instance of Windows XP that is ready for you to customize with your own applications. You can even use Windows XP Mode and Windows 7 to run applications seamlessly in Windows 7 when the applications are actually installed in Windows XP. Windows XP Mode is available for Windows 7 Professional, Windows 7 Enterprise, and Windows 7 Ultimate.