Friend has an old Dell XP machine. He can't find the discs to reinstall the OS. There is a partition on the HD with the OS reinstall. Can I copy that to a DVD then reinstall from the DVD? Tried to do a system restore but it doesn't go back far enough to get to a clean install. If I can re install from a DVD is there anything I need to know? I've not done this before. He's an older guy and on a fixed income. He'd like to get a new computer but he can't afford one since he's on disability.