I use to use the 60 day free Avast but after having such a fantastic run with it i purchased the professional edition . I ran norton 360 and copped that many viruses it wasn't funny . Avast jumps up and down and carrys on . I recommended it to a friend and he now gets his clients to have it installed on there computers . Since then he has not had one person come back with virus problems . I was getting rebuilds every 6 to 8 weeks because the whole system was getting corrupted . I haven't had a thing done to my computer in just under 12 months . And believe me i still go to places on the internet where a lot fear to go Norton wouldn't warn you about anything and then your system was infected Avast is the best thing since sliced bread