As soon as Microsoft Corporation is displayed at the bottom of the monitor I get an extremely fast Blue Screen and the process the repeats continuously. I ran a Bitdefender Boot disk and checked for Malware etc. Nothing found. I tried automatic startup repair but it stated that it couldn't find anything. I ran ERD7 and it stated that the system files were ok. I tried to run chkdsk /f /r /x from the command prompt but it stated that the drive couldn't be locked. I tried a repair installation. Nothing seems to work.