Windows will not boot. The root directory is corrupt and hence the "bad or missing System file". This came about after uprading Zone Alarm. During the mandatory reboot I logged in as someone other than the administrator. As it was nearly complete with whatever process it was doing after logging in I then logged off before the end of the process and tried to login as the administrator. It put me into a temporary (guest?) account. I thought that if I rebooted again it would fix the problem. It made it a lot worse. If I boot from an XP CD I get asked if I want to install or repair. When I select repair all I get is a C: prompt and corrupt directory. Can I recover my data?