Two excellent options to protect your computer from the omni-present threat of viral infection are: AVG and Avira. I have used both over long periods without any infections. They both seem to offer sufficient protection from infection and varying amounts of interference with other processes running on the computer. I have found that when AVG updates its software – not the daily update of virus signatures, it returns to default protection settings regarding its internal firewall. This can effect access to network devices and drives. Avira on the other hand does not seem to have this problem and for that reason I recommend it as my first choice at this time: Here is a link to the Avira Free Download!