The Best Antivirus App for Windows - from Lifehacker

The lifehacker website has changed its recommended anti-virus app for Windows. They recommend Avast Free Antivirus for the best balance between protection, ease of use, and cost. Their former favourite, Microsoft Security Essentials (also known as Windows Defender in Windows 8), has not been performing well enough in tests to keep its top ranking. For more information, see the lifehacker report The Best Antivirus App for Windows