Hello,  If you have Windows XP, there are two methods to determine whether you are running a 32-bit or a 64-bit version. If one does not work, try the other.      You can read the new Windows 7 upgrade page at my web site if you wish. It will explain in full detail how to perform upgrade installs of Win7, or a "Clean Install" that is required for you running XP.
I want to upgrade from Windows XP to Windows 7 and need to know if my computer is 32-bit or 64-bit.  How can I determine if my computer is 32-bit or 64-bit? Thanks
Upgrading to Windows 7