Avira-AntiVir

Avira AntiVir Personal Free Antivirus is a comprehensive, easy to use antivirus program, designed to offer reliable free of charge virus protection to home-users only. Avira offers: Extensive Malware Recognition of viruses, Trojans, backdoor programs, worms; Automatic incremental updates of antivirus signatures, engine and entire software;

Permanent virus protection, with Virus Guard real time monitoring; Install and configuration in just a couple of steps, setup to protect your PC in minutes; Virus protection against known and unknown threats, using an advanced heuristic system; Scheduler where you can set the scanner to make automatic virus scans or updates on your system; Forum and phone support; Knowledge Base with virus descriptions available on web site; Rootkit Detection and Removal; A modularized AV-search engine for improved scan performance.
link: http://download.cnet.com/Avira-AntiVir-Personal-Free-Antivirus/3000-2239_4-10322935.html