How do I determine if I have a 64-bit or 32-bit CPU?
32-bit or 64-bit Windows
If you're wanting to determine the version of Windows your computer is running follow the steps below for your version of Windows. Keep in mind that a 64-bit processor can be using either 32-bit or 64-bit version of Windows and that a 32-bit processor can only use a 32-bit version of Windows.
- Press and Hold the Windows Key and the Pause key or open the System and Security, System section in Control panel.
- In the System window by System type you'll have 32-bit Operating System if you're running a 32-bit version of Vista, and 64-bit Operating System if you're running the 64-bit version. Below is an example of what this would look like.
- Press and Hold the Windows Key and the Pause key or open the System icon in Control panel.
- In the General tab of the System Properties window if your computer says Windows XP you're running the 32-bit version of Windows. If the computer is saying Windows XP Professional x64 Edition you're running the 64-bit version of Windows XP.