|Did this suddenly happen or was it after you did something? |
Have you been running a registry cleaner?
How long have you had the problem?
If you tap F8 key while the computer is starting can you get to the startup menu (list with white letters on black)? If so there might be an easy way forward.
As a long shot (almost an aside), sometimes registry errors are reported when really you have RAM problems. Not sure if you are into this sort of thing but nothing lost cleaning the RAM edge connectors with a soft pencil eraser.
Always pop back and let us know the outcome - thanks