Avira Antivir Personal - Free Antivirus

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, etc. 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. 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. Version 8.2.0.334 includes new Virus Engine update.

Fuente: Avira

Personalmente, el mejor antivirus gratuito que haya existido en la historia (hasta ahora), Ingresa a este enlace para que descarguen la última versión. También pueden comprar la versión Premium, para los que les sobra la plata xD jeje.