As per the instructions of OA, you need to reinstall OA, reboot TWICE into Windows Normal Mode, then reboot once more into Windows Safe Mode and run the Control Panel "Add/Remove Programs".
If, after that, AIS has any problem, do a repair of Avast ("Add/Remove Programs" -> Avast -> repair -> REBOOT immediately).
If, after that, the firewall has any problem, delete the firewall rules and re-create them.