I'm working on installing Windows 7 Upgrade from XP Pro. I have XP on a 72gb RAID setup and I don't want to lose it. I am trying to install Windows 7 on to a 640gb hd. When I do the upgrade what will happen to my old XP setup on the 72gb drives? After installing can I dual boot into the Windows 7 on the 640gb or the XP on the 72gb?