I am using Avira Antivirus from last 6 months for my computer. It constantly scans my computer for virus, Trojan horse, worms etc. It reacts promptly when a malicious program is detected. Avira AntiVirus are comprehensive, easy to use antivirus program. It offers reliable free of charge virus Protection to our home-users for personal use only, and is not for business or commercial use. Available for Windows or UNIX.
Installation is easy, Interface is simple but Features and support is the area they have to work on more.