I was using 4, but it has deregistered itself at random intervals over the past year despite me having completed the website registration process and getting a 1yr valid serial number emailed to me. What has caused this, is it because I used the same serial number on 3 of my computers?
I've installed version 5 on my son's laptop, and created a brand new registration because it wouldn't allow him to reactivate the expired registration. Also, the Avast protection was automatically deactivated on his laptop when the 1yr registration expired, so it quickly acquired several dangerous virus infections which disabled Avast altogether. This has prevented any further warnings or alerts for the past few months, and left his laptop open to attacks. What should I do to make sure this cannot happen again if he can't reactivate his registration online?