I have an odd problem I've not been able to fix. I have a laptop from a friend of a friend, so I don't know much of the history of it.
Essentially, when started normally the laptop hits the windows 7 welcome screen, but instead of displaying a list of users, it flashes again and again. The cursor shows the busy circle next to it for a split second, then the screen goes black, then the screen comes back with the busy cursor.
The system starts normally in safe mode.
I've tried to disable all of the services and startup items with MSConfig, but that's made no difference. I've also run sfc /scannow which on it's first pass detected and fixed an item, but on subsequent passes sees no problems.
After that was a bust I decided to try to revert to a system restore point. There are several the choose from, but once selected the restore doesn't actually take place. The system simply shuts down after preparing to restore, and when restarted in safe mode states that it was unable to start the shadow copy service (which to the best of my understanding can't be started in safe mode)