Do I Have 32 Or 64 Bits?

[SpywareDr]

While holding down the [WinKey], (the key with the Windows Logo on it), press the [Pause/Break] key.

Then on the General tab:

• If you see:
  Microsoft Windows XP
  Professional x64 Edition
  you have the 64-bit version of XP Pro.
  
  
• If you see:
  Microsoft Windows XP
  Professional
  (nothing after the word "Professional"), you have the 32-bit version.