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Switching from 32 to 64-bit is not an upgrade. You must completely reinstall.
Make sure you have the product key, back up all your data to a separate drive using windows easy transfer or another backup tool, format the hard drive, and reinstall W7 64bit & all your programs, then restore your data.
Make sure you have the product key, back up all your data to a separate drive using windows easy transfer or another backup tool, format the hard drive, and reinstall W7 64bit & all your programs, then restore your data.