Hello, I have a customer that purchased a system from a less than reputable dealer where we live, and now is getting the pop ups that he might be a victim of software piracy. He has purchased a retail version or Windows XP, and I have that here. What I am wondering, is can we change his current installation from XP Corporate to XP Retail without re-installing? I ask because he has more than 700gb of data on a 1tb disk, and he doesn't want to risk it being screwed up in a back up/restore. He also has so many applications installed, it would take weeks to install it all again. If I have no other option, then so be it, but it would be much easier.