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Find if I've a 32-bit or 64-bit Windows

To determine whether your computer is running a 32-bit or 64-bit version of the Microsoft Windows operating system, please follow the steps below:
 
If you are using Windows XP, you may also want to consider this solution:
  1. Click Start > Run.
  2. Type “msinfo32.exe” then click OK.
  3. On the navigation pane, select System Summary.
  4. Locate Processor under Item in the details pane. Take note of the value.
    • If the value that corresponds to Processor starts with x86, the computer is running a 32-bit version of the Windows operating system.
    • If the value that corresponds to Processor starts with ia64 or AMD64, the computer is running a 64-bit version of the Windows operating system.
   
   
If you are using Windows Vista, you may also want to consider this solution:
  1. Click on the Windows orb (Start).
  2. Type “system” in the Start Search box, and then click System in the Programs list.
  3. The operating system appears as follows:
    • For a 64-bit version operating system: “64-bit Operating System” appears as the System type under System.
    • For a 32-bit version operating system: “32-bit Operating System” appears as the System type under System.


If you are using Windows 7, you may also want to consider this solution:
  1. Click on the Windows orb (Start).
  2. Type “system” in the Search Programs and Files field, and then click System in the Programs list.
  3. The operating system appears as follows:
    • For a 64-bit version operating system: “64-bit Operating System” appears as the System type under System.
    • For a 32-bit version operating system: “32-bit Operating System” appears as the System type under System.

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