Hello Peter,
We're sorry to know that.
We request you to follow the steps as mentioned under "Define network profiles" of this article and check the status.
If that doesn't help, refer this article and follow the steps to enable the system rules.
Keep us posted.
I have no idea why, After installing AVG internet security, everything works fine for about 1-2 days, then AVG goes and blocks all internet traffic. In or out, I've tried to play with the firewall setting and putting apps on "Alllowed" but it still blocks EVERYTHING. My computer is a paperweight until I uninstall AVG. After which I am able to use the internet again.