I was running Windows 7 Professional (OEM), AVAST Primier was my only Antivirus program. I have Malwarebytes installed, but it only runs on demand by me, the user. Windows defender is used for my firewall.
I upgraded to the latest AVAST as did this individual and it corrupted the OS for the NIC. The drivers were present, but I could not receive an IP address (IPV4 or IPV6). I tried everything that was listed here.
Using another machine, I downloaded the most recent drivers for the NIC and installed. (rebooted) no change.
Disabled Firewall (reboot) - No Change
Disabled, then uninstalled Avast (reboot) - No Change
Uninstalled Malwaebytes (reboot) - No Change
Purchased new NIC (reboot) - No Change
Set static IP's for V4, V6, DNS host, and default gateway - still no internet connection.
The only solution was to reload the OS. I decided to upgrade to Windows 8.1, after the installation the Netwok Connection restored.
You have a real problem with this latest release. it is corrupting the OS to the point a relaod is the only solution.