First download the latest virus definitions. Boot into safe mode and running a Disk Cleanup (right-click the C drive, Properties, Disk Cleanup) - that will delete all the files that are in these temporary locations, as well as IE's temporary files, etc. Perform a full system scan in safe mode.
It is recommended that you temporarily turn off System Restore. System Restore, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.
Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.
Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.
If this fails to rid the infection, then try running the Norton Power Eraser Tool to remove this threat.
http://security.symantec.com/nbrt/npe.asp?lcid=1033&origin=default