Sounds like it is the system restore file---go to control panel-performance and maintainance-system-system restore.then check turn off system restore on all drives. click apply then ok and reboot the computer.
When back into windows do the same thing but re-enable system restore by unchecking the bax.
Finally rescan with avg to make sure the virus has gone.
If it is in system restore it cannot do any harm to the computer UNLESS you need to restore it.This could unleash the active virus.