On a macOS computer, follow these steps to determine if the processor is 32-bit or 64-bit. There are no 64-bit versions of these operating systems. Windows operating systems, from Windows 95 to Windows 2000, are all 32-bit. If it has the text Windows XP Professional 圆4 Edition, the computer runs the 64-bit version of Windows XP.ĭetermine if Windows 2000 and prior is 32-bit or 64-bit On the General tab of the System Properties window, if it has the text Windows XP, the computer runs the 32-bit version of Windows XP.

Press Windows key+ Pause or open the System icon in the Control Panel.Below is a picture and an example of this window.ĭetermine if Windows XP is 32-bit or 64-bit The System window, next to System type, lists 32-bit Operating System for a 32-bit version of Windows and 64-bit Operating System if you're running the 64-bit version.Instead, the Pause key is a secondary function of a function key, and you need to press the Fn key and that function key.