I didn't clarify my original question - I ONLY have the full blown Windows XP (it is not the Upgrade). Will it work to install this over my existing WinMe or will it force me to format and thus lose everything ? Or are there other options I'm not aware of. I have bought XP with, and it was installed on, my laptop but, I would prefer PC and laptop to be of the same OS. If I should purchase XP Upgrade from WinMe please advise ... I'm trying to avoid the additional expense - but avoiding problems is of bigger concern.