ThreatFire AntiVirus Free Edition 4.6
Price : Free
Operating system : Windows 2003, Windows Vista, Windows XP

Publisher's description :
Traditional antivirus solutions cannot protect you until after they have discovered a new threat and produced a signature to counter it. ThreatFire does not rely on signatures, but instead provides behavior-based protection. It is designed to be used alongside your existing antivirus software and it fills the gap in protection between your antivirus signature updates. ThreatFire protects you against major security threats including viruses, worms, trojans, rootkits and even some spyware. Its advanced ActiveDefense technology intelligently analyzes the behavior of processes and programs on a system and immediately halts any malicious action. It continuously monitors all activities on your PC at a very low system level and uses a proprietary combination of analytics, risk algorithms, program histories and tolerance thresholds to identify and shut down threats so you are always protected, no matter how new the threat. ThreatFire is easy to use, instantly effective, and very light on system resources.
What's new in this version :
Version 4.6 reduces the confusion about the appropriate action to take, and incorporates patent-pending technology to provide accuracy.