Most programs written for Windows XP also work in this version of Windows, but some older programs might run poorly or not at all. If an older program doesn't run correctly, use the Program Compatibility Wizard to simulate the behavior of earlier versions of Windows.
Open the Program Compatibility Wizard by clicking the Start button , clicking Control Panel, clicking Programs, and then clicking Use an older program with this version of Windows.
To find out if your programs (or programs you plan to buy) are compatible with Windows Vista, go online to the Windows Vista Compatibility Center. This website contains a comprehensive list of programs and devices that work with Windows Vista.