BitDefender Free Edition includes four effective protection modules:

VIRUS SCAN - Powerful scan engines, certified by ICSA Labs, USA. It ensures detection and removal of all viruses in the wild.

LIVE! UPDATE - Intelligent update of antivirus protection, with no user intervention. The update can be done from the network over the Internet, directly or through a Proxy Server.

QUARANTINE - Secures infected or suspected files and moves them to a safe location, allowing them to be automatically sent to the BitDefender Lab.

SCHEDULER - Allows the user to set the launching of a scanning process once, at a certain moment, or periodically.

However, it does not have auto-protect mode where other free AV programs have

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I hope this information is useful for people looking for free AV software