Computers running Windows XP

Click Start, right-click My Computer, and then click Properties.

• If "x64 Edition" is listed under System, you’re running the 64-bit version of Windows XP.
• If you don’t see "x64 Edition" listed under System, you’re running the 32-bit version of Windows XP.

The edition of Windows XP you're running is displayed under System near the top of the window.