Is your computer running 32 bit or 64 bit Windows?

For Windows XP:

Right-click on My Computer and select Properties (or type sysdm.cpl in the Run dialogue box) and hit <<enter>>.

In the General Tab, the Operating System will be displayed as Windows XP Professional Version followed by the year for the 32 bit version.

If it is a 64 bit version, the OS (Operating System) will be displayed as “Windows XP Professional x64 Edition Version <Year>.