AVG Anti-Virus Free Edition 7.5.516

AVG Free Edition is the well-known antivirus protection tool. AVG Free is available free of charge to home users for the life of the product. Rapid virus database updates are available for the lifetime of the product, thereby providing the high level of detection capability that millions of users around the world trust to protect their computers. AVG Free is easy to use and will not slow your system down (low system resource requirements. Highlights include automatic update functionality, the AVG Resident Shield, which provides real-time protection as files are opened and programs are run, free Virus Database Updates for the lifetime of the product, and AVG Virus Vault for safe handling of infected files.

Version 7.5.516 features improvements in Resident Shield scanning and adds small improvements in installation process.

http://free.grisoft.com/doc/5390/us/frt/0?prd=aff

ClamWin Antivirus 0.88

ClamWin Antivirus is antivirus software for Windows. It provides a graphical user interface to the Clam AntiVirus engine. ClamWin uses the GNU General Public License. ClamWin Antivirus comes with an installer and open source code at no cost. It features: scanning scheduler, automatic virus database updates, atandalone virus scanner, integration to MS Windows Explorer, and add-in to MS Outlook.

http://www.clamwin.com/content/view/18/46/

ThreatFire AntiVirus Free Edition 3

ThreatFire features innovative real-time protection technology that provides powerful standalone protection or the perfect complement to traditional signature-based antivirus programs. ThreatFire's patent-pending ActiveDefense technology offers protection against both known and unknown viruses, worms, trojans, rootkits, buffer overflows, spyware, adware and other malware. It uses behavioral analysis to hunt down and paralyze threats that are too new or too clever to be recognized by traditional "signature-based" antivirus software. Powerful protection against zero-day and emerging threats.

Version 3 includes performance improvements.

http://www.threatfire.com/download/

PC Tools AntiVirus Free Edition 3.6

PC Tools AntiVirus Free Edition protects you against the most nefarious cyber-threats attempting to gain access to your PC and personal details. Going online without protection against the latest fast-spreading viruses, worms and Trojans can result in infections within minutes. Once infected, the virus will usually attempt to spread itself to your friends, family and associates by accessing your e-mail contacts and networked PCs. The infection may also allow hackers to access files on your PC, use it to launch attacks against other computers and Websites or to send mass spam email. That's why PC Tools AntiVirus Free Edition provides protection, with rapid database updates, OnGuard real-time file, Internet & e-mail protection and comprehensive system scanning to ensure your system remains safe and virus free.

Version 3.6 adds an Ignore option to the action list, implements Overall Progress bar, and improves engine.

http://www.pctools.com/free-antivirus/download/