Possible Duplicate:
OS version: 32-bit or 64-bit?
How can I find out which version of Windows 7 I am running? 64-bit or 32-bit?
Possible Duplicate:
OS version: 32-bit or 64-bit?
How can I find out which version of Windows 7 I am running? 64-bit or 32-bit?
Right click Computer->properties. Under system look at "system type", there you have it.