My desktop was working fine this morning. It uses windows 7 home professional. I turned it off and back on this afternoon (14 August 2013). During boot it updated 36,000 system registry files, which took about 30 seconds. It then gave me blue screen of death. On rebooting, Windows entered a function to automatically repair startup. After a few seconds this gave me a friendly message to say that it hadn’t worked. Now I get the BSOD during boot. Can anyone advise what I should do?