Avast 4.8 detects it but It can not delete. I restart computer and avast detects and deletes but even restarted… a message is shown with the advertise… virus found.
Disable System Restore and reenable it after step 3.
Clean your temporary files.
Schedule a boot time scanning with avast with archive scanning turned on.
Use SUPERantispyware and/or Spyware Terminator to scan for spywares and trojans. If any infection is detected, better and safer is send the file to Quarantine than to simple delete than.