Hello Willy,
Most all of us agree that an upgrade is not the route to take. It leaves useless files on your system and can cause conflicts.
Save all you Documents, Pictures, contacts, videos, music, etc to a flash drive,
Be aware, you will need to re-install your 3rd party applications.
There i poll going on now and "clean" install is winning by a mile.
You will no doubt carry over unnecessary files from the 32-bit edition.