I would suggest that you start your own ‘new topic’ here http://forum.avast.com/index.php?board=2.0 so as not to become mixed up in this one and we will try to help.

In that topic please answer these questions:
What avast version did you download and install or if you started out with the free version and are upgrading ?

Have you received an email with your license file license.avastlic and have you entered it ?