AVG have an option which u can give an order to let the kal engine pass. Just like the windows firewall, you can make an exception. FInd it in the avg options. Each anti virus have that.
There is also a shield look a like under ur system tray u might chk that out and there must be an options to unblock the program. Read the manuals of ur avg program.
Good luck,
Cheers,
Blood