Your computer is infected with a dangerous infection:
http://www.helpmyos.com/malware-threat-removal-f6/virut-information-t879.htm
We have hit a dead end. Please tell me when you have completed a reformat and reinstall.
I am sorry for the bad news. I do not understand why these mean people make such harsh viruses, and I wish there was a way to clean your system without everything being damaged. But, the problem is, cleaning the system, most files will be damaged. It is like trying to clean up a city that just had a tornado or hurricane run through it. Takes rebuilding, and time to set back up.