How can I tell if Im running a 32-bit or 64-bit version of Vista / Windows 7?
Click the Start button Picture of the Start button, right-click Computer, and then click Properties. If “64-bit Operating System” is listed next to System type, you are running the 64-bit version of Windows Vista or Windows 7. If “32-bit Operating System” is listed next to System type, you are running the 32-bit version of Windows Vista or Windows 7. The edition of Windows Vista or Windows 7 you’re running is displayed under Windows edition near the top of the window.