I've had that happen to me before. I asked around here, and got pretty much no answer. I couldn't boot in safe mode, w/o networking, or even in command prompt without it restarting.Mine didn't stop until i re-installed windows. So, instead of losing all your files, do this:
Download a version of "Live Linux" (like Knoppix or Puppy Linux). When you download and burn the files to a cd, insert the cd into your malfunctioning computers CD drive. The next time it boots up, it'll boot directly to the linux OS (should, anyway). That way you can save any files you want to. E-mail them to yourself, put them on a floppy/thumb drive, send them to a friend to be retrieved later, whatever.
Then, keep Knoppix or whatever Live Linux distrobution you downloaded. It's been a major factor in my computer history, since windows seems to crash about as often as you hit the "F" key on your keyboard. I still have files that are 6 years old, but have had to re-install windows at least 6 times on 2 different boxes.
Hope this helps.
Edited by Heretic Monkey, 19 June 2006 - 10:45 AM.