Avira Antivirus Premium 2012 and Webroot Secure Anywhere Essentials chose avira because it has consistent high marks in detection tests and doesn't nagg. I also like the red taskbar icon. chose Webroot because the resource usage is insanely low and it came highly recommended. They gave me a few extra months on the house. details: avira's mail and browser protection engines are disabled at install. All default settings. webroots firewall is set to maximum protection.