So far, i've experienced and liked only 3 AntiViral Softwares.
Order as per Recommendation
1. Kaspersky Security Suit 2009
2. Avira Antivirus
3. Norton Internet Security
NOD, Panda, AVG all failed me. Crap softwares according to me. Dont say about those who are happy with these. There is another Program called "Trojan Remover" IF installed with these, can make your system secure in true meanings.