Two antivirus programs on one system? Heresy, right?
Well, not if one is designed to play second fiddle. As it turns out, Avast, one of the best free antivirus programs, can do just that. Just download it, run the installer, and pick the second option–“Compatible install – install as the second line of defense.” Be sure to de-select the option to install Google Chrome and make it your default browser, unless you want that. Free programs often come with ridealongs.