Damn I was gonna suggest the eggtimer. :-(
And if you're going to do extensive works you better learn to save. 'I'm late with the project because I was too dumb to save periodically and my machine crashed" is a quick trip to the unemployment office and IT jobs are getting scarce.
PS Your machine should not crash if you are using Win 2000/XP. Maybe a post about the crashes in the hardware forum would be helpful?