Immunet Corporation - (Freeware)
While co-existing with other existing antivirus products, Immunet Protect Free complete the protection of the computer offering many interesting features.
Immunet Protect Free is an antivirus software based on "CloudComputing" experience of a community of users. This means that if the software installed on a computer encounters a threat, all of Immunet Protect users are protected against it.
Alongwith this benefit, "Cloud Computing" has another  advantage: it increase the speed of the computer while delivers real-time protection against viruses, spyware, bots, worms, trojans, and keyloggers without slowing down the computer.
An interesting feature of this software is the compatibility with the existing antivirus products from the same computer for a better protection.
* The "My Community" and "Notices" features have been removed from the UI. These became redundant long ago as we found a way for our Cloud Servers to ensure all users received the full protection of Immunet's global community of over 2 million users, rather than just the few immediate users most people had in their local communities.
* Now "Immunet 3" instead of "Immunet 3.0". There are so many minor changes since last major release that had to rev version number.
* Full Windows 8 and Windows 8.1 support!
* New and improved versions of both the Tetra and Clam engines!
* Bug fixes for network related issues that would cause Net Bios name resolution failures, VPN connection failures, and BSODs.
* Bug fixes for XML locking issues.