Some people have been losing sleep over the “what if” question of upgrading to Windows Vista, and having it screw up. Then not having the option to go back to Windows XP because Windows Vista ate their license during the upgrade. Well, fear not friends! Super Windows Geek Paul Thurott has figured it out. A clean Windows Vista installation can be done with just the upgrade DVD. Although a bit tedious, it gives you an out in case of disaster. Daily Tech has put up a prettier version of the work around. Great work guys!