What to do if your computer is already infected with a virus

Please note: Many virus infections cannot be detected or repaired from within the affected system while it is running.

The most effective way to remove an infection is to erase (format or "wipe") the entire system drive, and then reinstall and secure your operating system and needed applications.
For a more detailed guide: refer to the Safe Computing guide "Securing a Personal Machine", Part Three: Attempt to Repair an Infected Computer.

Preliminary Steps – To be done on a non-infected computer. NOTE: Do not try to plug an infected computer into a working Ethernet jack on campus.
If your computer does not have Symantec AntiVirus installed on it, download this at http://www.umn.edu/adcs/software/security/. When you download it, choose the option to save the file onto your computer.
Go to: http://securityresponse.symantec.com/avcenter/download/pages/US-SAVCE.html. read more