How to Check Windows XP is 32 bit or 64 bit?
Type winmsd.exe and then click OK.
It Will open System Information Window
In the details pane, locate Processor under Item. Note the value
If the value that corresponds to Processor starts with x86,
the computer is running a 32-bit version of the Windows operating system.
If the value that corresponds to Processor starts with EM64T or ia64,
the computer is running a 64-bit version of the Windows operating system.
Note: – Intel Itanium-based computers can only run 64-bit versions of Windows.
Intel Itanium-based computers cannot run a 32-bit Windows operating system.
Currently, 64-bit versions of Windows only run on Itanium-based computers and AMD64-based computer