Helping people with computers... one answer at a time.
Determining whether or not your process or operating system is 32 or 64 bit is very easy with the aid of a tiny tool, and knowing where to look.
How do you tell if an operating system is a 64-bit or 32-bit?
I'm going to expand that to include both hardware and software.
In other words, how to tell if you have a 32 bit or 64 bit capable system, and then whether or not you have a 32 bit or 64 bit operating system running.
You could, of course, download and run the Windows 7 upgrade advisor, I suppose, and it'll tell you a lot about your system, including whether or not it'll support the 64 bit version of Windows 7.
But that's overkill.
Download, instead, Securable, a tiny little utility from grc.com. Run it, and you'll get the answer about your hardware. Here's mine:
As you can see, my CPU can handle 64bits even though I'm currently running a 32 bit version of Windows XP.
To find out what your operating system supports, right click on My Computer, in Windows XP and click on Properties:
If it doesn't say "64 bits", then it's 32.
In Windows 7 right click on "Computer" in your start menu, then click on Properties:
The resulting screen shows exactly which version you're running.
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