Yes but which of the update settings ?
Just to be sure - Does Comodo allow avast.setup internet access ?
- If it does delete the entry for it and do a manual update, this should force the firewall to ask permission again.
Try changing the Update, Update Parameters settings to 'My computer is permanently connected to the internet' if you are on broadband.
Try changing the Update, Proxy Settings to Direct connection (no proxy) unless you use a proxy ?
Try a repair of avast. Add Remove programs, select 'avast! Anti-Virus,' click the Change/Remove button and scroll down to Repair, click next and follow.