I may have spelt that a tad wrong ?
It could be caused by a few things, searching at click here came up with a lot of Win2000 O's with the problem.
I would use the factory restore as it can vamp your HDD from the boot sequence all together if it goes wrong using a command promt edit.
It can also be faulty memory causing it say's Overclockers.
Factory restore safe. Is it under warranty ?.