You have your location set to public. windows firewall on a public network defaults to maximum lock-down nothing works (web pages should if they don't have plugins). It will also reset frequently on public to make sure anything on this "un-secure" network isn't affecting it.
This is the default when you connect via a mobile phone or Mifi or if you did not set the location when prompted when you first connected.
If your on a private network or your phone and have a decent password set, change your location to private (work/home).