Can’t access Chest. I am only able to “delete” found viruses. Is Chest only available in Pro edition?
You may wanna take a look at here: http://forum.avast.com/index.php?topic=44723.0
And what happen…do you get any error messages?
Have you tried to repair avast?
The only “error” message I got was “error on page” in red. Nothing else. And then a window offering me the “delete” option.
Welcome to the forums, GuyGrand. 
Please a repair of avast :
Control panel > Add/remove programs > click once on avast to select it > click on Change/Remove > scroll down the left pane and click on repair > click OK > follow directions