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I'd like to check if a process is running in 64 bit or 32 bit mode. How can I do this? Process Explorer will tell me if the Image is 32-bit or 64-bit, is this what I should be looking at?

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Yes, that's right, you can identify this by the Image Type in Process Explorer. –  Tom Wijsman Mar 17 '11 at 13:14
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up vote 7 down vote accepted

Can we assume this is a windows question? xp x64, vista, 7 ??

In Windows 7 I believe a 32 bit application running in a 64 bit OS has a *32 after its name in the Task Manager...

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Just to add to this old answer, yes use Process Explorer. You can right click on the columns and select Image Type to show which processes are 32 bit and which are 64 bit. Run Process as Administrator to see some services.

http://live.sysinternals.com/procexp.exe

enter image description here

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