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12 Aug 2009  

Windows 7 Ultimate x64

You cannot upgrade from a 32-bit OS to a 64-bit OS. You will have to backup data, clean install and then reinstall the software apps that you are going to use.

Plus, 32-bit versions can handle up to 4GB of if you only have 2GB of RAM...that's not a good reason to move to 64-bit. There is a bit more overhead with 64-bit I wouldn't recommend making the switch until you have at least 4GB of RAM.
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