Oh, and as for "system restore" being the best thing microsoft ever invented?!?!??! PLEASE!!!!!!!!!!!!!!!!!!!!!!!!
You CANNOT rid your system of a virus if you have this running - virus hide in the "windows protected" files and CANNOT be cleaned UNTIL you turn system restore off.
Viruses don't "hide" in the restore folder, windows can backup a virus in this folder as part of sys restore functionality.
To remove this you need to switch it off, reboot and run a scan. Then RE ENABLE it, it is an excellent bit of kit, invaluable.