How to determine whether a computer is running a 32-bit version or 64-bit version of the Windows ope

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[Dozryan]

[h=3]Computers running Windows XP[/h]

• Click Start, right-click My Computer, and then click Properties.
  
  • If "x64 Edition" is listed under System, you’re running the 64-bit version of Windows XP.
    
  • If you don’t see "x64 Edition" listed under System, you’re running the 32-bit version of Windows XP.
  The edition of Windows XP you're running is displayed under System near the top of the window.

[h=3]Computers running Windows Vista or Windows 7[/h]

• Click the Start button Link Removed, right-click Computer, and then click Properties.
  
  • If "64-bit Operating System" is listed next to System type, you’re running the 64-bit version of Windows Vista or Windows 7.
    
  • If "32-bit Operating System" is listed next to System type, you’re running the 32-bit version of Windows Vista orWindows 7.
  The edition of Windows Vista or Windows 7 you're running is displayed under Windows edition near the top of the window.
  
  
  Got this from Microsoft website