I've used Norton, McAfee, F-Secure, AVG, MSE, Comodo - none of them come close to Avast!. Everything else lets the bugs in and then tries to kill them. Not Avast! It prevents them from getting in, in the first place. And, it's extremely light on resources. I love it. I even use it with only the Windows firewall and feel confident. I've installed it on numerous people's computers and recommend it to everyone. Thanks Avast!