Paid Avast IS on Win 7 64 bit Ultimate

Not exactly the same problem, but similar.

I am logging a service error at every start up, for the Home Group Listener service (currently set to Manual start). It is a 7024 Windows error, Description:
The HomeGroup Listener service terminated with service-specific error %%-2147023143.

The HGL service is therefore not running. If I go to start it manually, it will not do so.

HOWEVER, my Windows Firewall service is set to Manual (i.e. it doesn’t start) as I leave the firewall protection to Avast. If I then start my Windows Firewall service, I can then also start the Home Group Listener service. I don’t really want to have two firewalls (Win and Avast) running at the same time, as I understand this can cause problems.

I would welcome any info on settings in either Windows or Avast which would prevent the HGL error occurring.