|I had this problem. It was caused by something (I think) to do with the fake userinit virus. |
I'm am far from an IT professional - so perhaps ask someone who knows more about this stuff about this type of virus? Could be the same cause.
I was able to log back in by creating a BARTPE start-up CD which allowed me to edit the system behind the scenes (something you're supposed to know what you're doing to take on). From there however I was able to recreate the real userinit file and it seemed to work. I wasn't editing the registry, and BARTPE allows you to do that - all advice however is that this is best left to professionals. Maybe someone on here knows more?
My laptops still got loads of problems however....