re-initialize the AVG Firewall component in Windows:
- Open menu Start -> (Settings) -> Control Panel.
- Double-click on Network connections.
- Right-click on the connection you are using and select Properties.
- Under This connection uses the following items un-tick AVG network filter driver.
- Click OK to store the changes.
- Once more right-click on Local are connections -> select Properties.
- Tick the AVG network filter driver and click OK.
- Restart your computer.
Check if this fixed your problem. post back if it doesn't work.