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#11
you can not upgrade from 32bit to 64bit, you must do a clean install. I'd advise backing up your files and formatting the drive.
32bit apps run on 64bit windows, but for the most part you will need 64bit SIGNED drivers. I would check that all the hardware in your computer has 64bit drivers posted before upgrading. That way, you dont end up with a piece of hardware that doesnt work.