If you follow the instructions you cannot be at this situation:
1. If you need another licence key, the registration form can be found
here.
2. Do you have any other antivirus installed into your system? Did you have in the past? Which one?
3. The Outlook is freezing because of the wrong installation of avast. Maybe you can go to 'About' dialog and un-check the avast! plugin (I'm not sure because I do not use Outlook).
I really suggest you finish your installation correctly then, if you want :'(, desinstall it by Control Panel.