So I have an old Seagate Barracuda 7200.9 right now and I'm going to buy a WD 640GB Cav Black... I'm not sure whether or not to ghost the data from my Seagate over to the WD because when I switch the motherboard I'll most likely have to put in a Windows key and I don't have one because my computer didn't come with one when I bought it at BB. What exactly are my options? Can I just use a friend's XP key? Do I need the actual Windows XP key? Can I just plug in the new WD drive, transfer all the data I want to keep, and THEN install Windows (probably W7 for now cause its free) on that drive? I'm pretty confused, anybody want to chip in what they think is the best way to handle this?