I was going to suggest Safe Mode. I lost my System Restore, and haven't been able to get it back yet. I've tried Safe Mode, and that usually works for things like that. For example, I've had problems with Defragment, but Safe Mode fixed it; same with failed System Restore attempts. I first do it in Safe Mode, and then do it again in regular boot up. But it's not working this time. I can't find a date it will restore to. It will go through the process, but fail to restore to any earlier date I assign.