Avast Free is one of the best free anti-viruses, for the moment, providing its users with good protection and an easy way to manage it.

Avast Free 5, formerly known as the Home Edition, protects your system with multiple guards. The antivirus, antispyware and heuristics engines form a security core that also includes multiple real-time shields. The adjustable mail and file system shields join the pre-existing behavior, network, instant messaging, peer-to-peer, and Web shields. The behavioral shield is a common-sense feature, as security software publishers leverage their large user bases to detect threats early and warn others.