Follow these steps to determine if your computer is running Windows XP 32bit or 64bit
Click Start, right-click My Computer, and then clickProperties.
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 underSystem, 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.
Please click here if you have Windows XP 32bit
Please click here if you have Windows XP 64bit