Yesterday I upgraded from Windows 8 to 8.1 on my Dell Studio XPS PC. Everything was working fine until the update completed. Now the only browser that works is IE 11. The only web sites that will work on Opera, Chrome, and Firefox are Google sites. I tried uninstalling and re-installing Chrome but no luck. Also I have HMA VPN and that will not connect as well. Seems like any app that connects to the internet will not work. It will connect to my internal NAS and network at home.
Note that my connection is a wired connection.
I had Windows firewall turned off in Windows 8 and it is still turned off in 8.1.