Posted 10 January 2006 - 06:14 PM
Do you have a windows xp disk?
If so, boot from the xp disk and it will try to find your c drive.
If it can't find it, you may have a bad drive.
If it does find it, go to the second screen and try a repair to see if that gets you back to normal.
Afterwards scan for viruses and malware, as one of these may have caused your problem.