I have an older pc and have XP Pro. My hard drive needs replaced. After replacing the hard drive,can I use a Win 7 reinstallation disk instead of my original XP Pro disk? Will the drivers and utilities that are already installed on my pc (lap top) accept the Win 7 reinstallation? Do I need to install the drivers and utilities disk if I do indeed install Win 7? What kind of problems can I expect if I do reinstal with Win 7