I recently upgraded windows 7 ultimate x64 from my vista home premium x64, however, the new upgraded win 7 includes too much junk and slows down my laptop a lot. So I would like to do a clean install. My question is: I have already activated my upgraded win 7, so if I reinstall my win 7, would I activate the new win 7 by the same activation code? P.S. I upgraded my BIOS (From my laptop producer website) after upgrade, does it matter? Thanks!