A little explanation on how I added an exception to AVG to allow NMM to connect through it. Open AVG, then click Firewall. Then select "Tools/Firewall Settings". On the right side of your screen, click "Add" On the line that says "Path", click on the button with the "..." on it, this is the browse button. A window will open, simply point it to the executable for Nexus Mod Manager. Mine is "C:\Program Files\Nexus Mod Manager\NexusClient.exe" Yours will be wherever you installed it to. Hope this helps!!!