on the net there is a big fight started many years ago about the best free antivirus, many sites say AVAST, many sites AVG,, many say AVIRA, is like real madrid, manchester and milan, all are very good teams, but who is the best? people use avast will say is the best, same for people use avg, same for avira, use the one you like and do not think if you are right o wrong, the best antivirus is the person sit on the pc.