Their scare tactic pop-up. When brother in law said they had this popping up, sounded like malware. Also the fact one day it said it would be £60 then suddenly the next day they logged in it dropped to £19.99

Avast! have seriously failed with this scare tactic. Will never use them again.

http://imageshack.us/photo/my-images/850/nastyavastadvert.png/