Rising Antivirus Free Edition

- Does a scan of memory as it's being installed which is a good way to check for any malware that may be present.

- Has Rising Cloud Security where users contribute information to get a rapid response to new threats.

- You can assign a password to Rising Antivirus so others can't change your settings.

- Has a "silent" SmartUpdate and you set how often.

Free Antivirus and AntiSpyware - MWAV

- Available in multiple languages including French, German, Icelandic, Italian, Polish, and more.

- Has a very fast virus definition even compared to many commercial products.

- Highly configurable as to what is scanned - drive, programs only,

Avira AntiVir Personal - Free Antivirus

- Has an optional Registration which you can bypass if you wish.

- Has a nice configuration wizard that gives you lots of options.

- Is very fast and thorough.

- Has a full-featured control panel.

AVG Anti-Virus Free Edition

- Offers a Security Toolbar that monitors dangerous Web sites.

- Has a nice "First Run" wizard that helps you set-up the program.

- Excellent control panel where you can see and handle all aspects of the program.

PC Tools AntiVirus Free Edition

- Has a solid, professional interface.

- Features IntelliGuard Protection to monitor email, files, and memory.

- Has a number of configurable options.

- You can schedule scans every day, every weekday, every week, and so on.