Then you can either migrate to the working OS or troubleshoot/scan the other OS.
I am running windows 2000 professional. I received two error messages before my computer shut down. 1-"Norton Anti Virus 2005 was unable to scan for infections" 2- "microsoft office 2000 disc 2 internal error 2318: Please contact product support for assistance". The computer shut down and then restarted and it keeps restarting even in safe mode. any suggestions.