Not sure if your installed version of Windows is 32-bit or 64-bit? If you're running Windows XP, chances are it's 32-bit. However, if you're running Windows 8, Windows 7, or Windows Vista, the chance that you're running a 64-bit version goes up considerably.
Of course this isn't something you want to take a guess at.
The specific steps involved in determining if you're running a 32-bit or 64-bit version of Windows depends a lot on which operating system you're using:
- How To Tell if You Have Windows 8 64-bit or 32-bit
- How To Tell if You Have Windows 7 64-bit or 32-bit
- How To Tell if You Have Windows Vista 64-bit or 32-bit
- How To Tell if You Have Windows XP 64-bit or 32-bit
Note: There are no 64-bit versions of Windows 7 Starter, Windows Vista Starter, Windows XP Home, or Windows XP Media Center Edition.