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#20
That simply sums up one basic fact. When you change platforms from the 32bit to 64bit or vice versa consider it as if you were changing OSs entirely where you would need to perform a clean install right from the start.
In 99% of the cases it does turn out to be user error especially for novices without experience in how to perform upgrades and certainly lack in performing clean installs from scratch. Mostly this is with people who always bought prebuilds with preinstalled versions of Windows or one of the other OSs.