You have a real nasty infection on your system. Virut/Virtob is a file infector which infects all .exe and .scr files
, downloads more malicious files to your system, and opens a back door that compromises your computer
. In many cases the infected files cannot be deleted and anti-malware scanners cannot disinfect them properly. When disinfection is attempted, the files become corrupted and the system may be irreparable
Even if you could logon, many experts in the security community believe that once infected with this type of malware, the best course of action is to reformat
the OS - "When should I re-format?
If your computer was used for online banking, has credit card information or other sensitive data on it, all passwords should be changed immediately
to include those used for banking, email, eBay and forums. You should consider them to be compromised
. They should be changed by using a different computer and not the infected one. If not, an attacker may get the new passwords and transaction information. Banking and credit card institutions should be notified of the possible security breech.
Virut/Virtob is contracted and spread by visiting crack and keygen sites
. Those who attempt to get software for free end up with a computer system so badly damaged that a Repair Install will NOT help!
Reinstalling Windows without first wiping the hard drive with a repartition and/or format will not remove the infection. The reinstall will only overwrite the Windows files. Any malware on the system will still be there afterwards. Starting over, reformatting the drive and performing a clean install removes everything. You should not backup any .exe files because they are probably infected but you can backup documents and pictures.