How can I tell if my computer is running a 32-bit or a 64-bit version of Windows?

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To find out if your computer is running a 32-bit or 64-bit version of Windows in Windows 7 or Windows Vista, do the following:

  1. Open System by clicking the Start button Picture of the Start button, right-clicking Computer, and then clicking Properties.

  2. Under System, you can view the system type.

If your computer is running Windows XP, do the following:

  1. Click Start.

  2. Right-click My Computer, and then click Properties.

    • If you don't see "x64 Edition" listed, then you're running the 32-bit version of Windows XP.

    • If "x64 Edition" is listed under System, you're running the 64-bit version of Windows XP.

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