Well, I did it. Made a password I couldn’t remember, and did not back it up, or even write it down. It keeps me completely out of the program. I believe I was able to attach the registration #.
Baran Khan
Thats a problem. You cannot even uninstall it without password.
Maybe one of the evangelists knows more about this.
Or you can contact Avast over this form: http://www.avast.com/contact-form.php
Good luck. 
only one solution … New clean install
Uninstall utility http://www.avast.com/en-no/uninstall-utility
install files http://www.avast.com/en-no/download-software