This is a W7 HP Laptop Probook 4520S. Yesterday, a free version of Advanced System Care was installed and run. There were no problems with the system after the "clean up" by the Advanced System Care product. The system was shut down normally last night. This morning, on start up, the laptop goes to the password screen, is then keyed but instead of the Windows screen, we get "starting drive encryption" followed quickly by "Safe Boot has been corrupted, 92H". I may not have all of the words exact but close. The system's drive was never intentionally encrypted. We're trying to boot via a CD and cannot seem to do that either. I think I may have an image on the drive which we could possibly use.