After upgrading my bios and Video drivers, Xp started working funny(clicking noises and when I press the start key , outlook expres will lunch . So I reboot my pc and I got this message "Windows could not start because a file is missing or corrupted" the file is " windows\system 32\ config\system" Also the message told me, that to repair the problem boot from the XP cd and run the repair application. I did that and the PC just froze everytime. I activated XP 3 days ago. Wold I be able to reinstall XP without problems? or Do I have to contact Microsoft for a new activation?