I have a hp dv2000 and I left it on one night and

I have a hp dv2000 and I left it on one night and when I woke up the next morning it had shut off. When I turned it on it came up with a screen saying "We apologize for the inconvience, but Windows did not start successfully. A recent hardware or software change might have caused this. Then it goes into a few different ways to start it. Such as Safe mode, starting normally or going back to the last known good configuration. I have tried all of these and it acts as though it will start windows but then goes back to the same screen. It doesn't sound like anything is running except for my cd/dvd drive clicks a little. Please help!