In order to use the Avast Driver Updater free trial, you need to buy a registration key. (I'm also pretty sure 15 of my drivers aren't outdated) : r/assholedesign
Install Avast Antivirus in Ubuntu 12.04 Precise - Ubuntu Sharing
Avast free registration key for older versions has a problem!!!
Avast Free license key sent in email not valid and registering issue
Register avast! free antivirus 2014 - Get 1 Year Licence Key | PPT