Ask Paula!

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.

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