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There is at least 15 threads just like this one in these forums. You just have to use SEARCH feature in these forums. That’s why it’s here… instead of making thousands different posts with same issue. It just clogs forums and makes much more difficult for us to follow all these posts… Not telling anything against you, but just pointing that it would be much easier and much faster for you to find answer that way, than to wait for someone who will accidently find your post among all those threads… 
Take a look in here, and follow my advice:
[b]http://forum.avast.com/index.php?board=2;action=display;threadid=8951;start=0[/b]
Cheers !
EDIT: on second page of that thread, you’ll find screenshots and how and where you should perform those changes
BTW, WELCOME to forums !!!