This is a problem for me that has been going on for an extended time. My computer will just up and go black and restart itself, and the blue screen comes up that it was not shut down properly and c/drive needs checked for consistency. I run XP PRO. anyhow it does the scan, sometimes files are found not to be valid and will be truncated mostly those come from either Firefox, or Ytunnel.
anyhow it does start, and sometiimes the window pops up to tell me system has recovdered from a serious error, and i send an error report to windows and it said an unknown driver was the most likely cause. other times i do not get the error window at all. this has been an ongoing thing, almost a year, and it continues to work fine, aside from that.