I've got a friend whoes mobo just died. She wants to upgrade as the dead one was about three years old. When she gets new mobo she will have to reformat and reinstall XP. Will she be able to use her old XP or will she have to rebuy it. It was regestered with the old mobo. What is your LEGAL computer? The mobo or the case that contains the mobo. I don't know, but I know someone here will have the answer. Thanks in advance for the help..