My bet is a False Positive for a generic detection. If you can live with that assumption, OK,
anyway - only detections found in the registry.
If you restore to a previous point in time will avast still detect this?
Best policy is to wait for an update where this will get cured, and if not come to further investigate.
Anyway there is always the option to have the removal experts like essexboy and the likes have a look into the matter.
polonus