I want to take my Windows 7 from 32-bit to-64 bit. I know that to get from a 32 bit OS to 64 bit you have to do a clean install. Problem is, i upgraded to 7 from Vista about a year ago using a 32 bit version downloadable installer so there's no discs with 32 and 64 bit version. So I guess my real question is can i use a 32 bit upgrade version's key on a 64 bit non-upgrade version? I could download a 64 bit version ISO and do a clean install with that, right?...as long as the key i already have would work?