My firewall also seems to not be working. I updated avast and rebooted my computer.
I just purchased the Internet Security yesterday. Everything is working perfectly except the firewall.
I don't have any other antivirus applications installed and I tried turning off and on my Windows Firewall but still to no avail.
I tried going to "Fix now" and then clicked turn on firewall but the message I always get is "Unable to start Firewall!"