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How do I know if I'm running a 32-bit or 64-bit version of Windows?

The most comprehensive guide to outlining the steps on what to do to find out is provided by Microsoft, located on their website under : http://support.microsoft.com/kb/827218/?FR=1 , but here's a cheat-sheet version to keep handy!

XP or Windows Server 2003

  1. Click Start>Run
  2. Type sysdm.cpl . Click OK
  3. Click the General tab.
  4. Look at the operating system.

If the operating system has an x64 in it, then you are running a 64-bit version. If you do NOT see this, you are running the 32-bit version.

Vista

  1. Click Start. Type system in the Start Search box.
  2. Click system in the Programs list.
  3. Look at the operating system.

The System type under System value will show either 64-bit or 32-bit.

Tuesday, May 20, 2008 6:23 AM

Feedback

# re: How do I know if I'm running a 32-bit or 64-bit version of Windows?

Thanks for a clean answer to a simple question. I really appreciate it!!! 7/30/2008 7:11 AM | Chris Kirby

# re: How do I know if I'm running a 32-bit or 64-bit version of Windows?

Wow, Thanks alot :) Ive been searching all over but all i could find was xp and stuff... Thanks :)
2/24/2012 8:15 PM | jack

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