in your case of a completely hosed system you need to first download and use AdawareSe and Spybot Search & Destroy, install them, update them and use them....they may be able to repair your obviously corrupt system...if not, then if you have system restore activated, roll back to a previous point in time when the system was 'good'...if that fails I guess just backup your data, reformat the drive and do a completely clean install of the OS and start all over again....