system
7
So the connection problem starts at the very same moment / while installing Avast?
Maybe you should review again any pre-installed tools. Then get the removal utility for Avast http://www.avast.com/uninstall-utility. Run it under Windows Safe Mode.
Reboot and download again ANEW the setup.exe of Avast.
Please save a new restore point.
Now please disconnect any network connections and disable your WIFI.
Run the Avast installer as admin (right click, “Run as Administrator”). Immediately after installation, please reboot (even before anything else, before configuring, before updating).
After reboot, wait a couple of minutes for all system services to be active (including Avast services). I’m not kidding. At LEAST 2 minutes (100 would be much better).
Configure Avast → troubleshooting → “load Avast service only after other services”.
Reactivate your connections, but don’t update Avast yet. Once the Network Center recognizes your re-enabled connections, reboot yet one more time.
Please report back