avast free antivirus is a full-featured antivirus package for Windows or Mac OS X or Android or iOS
Intelligent Antivirus with new DynaGen technology
Anti-malware Protection plus anti-spyware & anti-rootkit
After 25 years of innovation, still the most trusted antivirus in the world
If you haven't heard of AVAST, we're only the most trusted name in antivirus, actively protecting more than 200 million PCs, Macs and Androids/iOS devices. So many people trust us because we've been protecting devices and data for 25 years, in over 40 languages (more than any other antivirus solution), on every populated continent in the world.
http://www.avast.com/index-win
http://www.avast.com/indexCategories: anti-virus - system security - Windows systems - virus detection - Mac OS X Systems - Mobile Devices - iOS - Droid