32-bit or 64-bit processor?

How to determine if your system contains a 32-bit or 64-bit processor.
1.  On the Start menu:
   1a. For Windows* 2000, select Settings and then
       select Control Panel.
   1b. For Windows* XP or later operating systems,
       select Control Panel.
   1c. Open the 'System' applet (you may first have to
       select 'Switch to Classic View').
2.  Select the 'Hardware' tab.
3.  Select the 'Device Manager' button.
4.  The processor type will be indicated by the value under
   the 'Computer' section on the 'General' tab.