maybe you have something like (hide my ip address) software running on your computer without knowing. check your programs list to see if there are any programs on the list designed to hide your ip. this should tell you your ip if not its being deliberatly hidden by a program.
You posted this query originally in the incorrect forum. I had to move same and delete an unnecessary duplicated post and despite this you reposted same. Please refrain from doing so again. There are some previous AAM threads which may give you some advice on your AVG problem.
You should be aware that Askaboutmoney is an Irish website.