I've used a lot anti-virus software, from Norton to avg free...
But my favorite is Bitdefender.
"BitDefender has a well-designed interface. A slider bar in the main window provides an easy way to modify levels of security protection, and clearly marked icons let you launch full scans and set up custom scans. BitDefender was also the only product to offer free 24/7 phone support, with easy-to-find phone numbers and support e-mail addresses listed in the "Help" section of the application."
"BitDefender 2008 provides home and SMB users with an unmatched level of protection that defends against tomorrow’s threats today,” said Bogdan Dumitru, BitDefender CTO. "As hackers and spammers rapidly change their tactics, our patent-pending B-HAVE heuristics technology provides users with the highest levels of proactive protection from zero-day and unknown malware threats. The new capabilities offered in BitDefender 2008 – including 64-bit support and the Gamer Mode – also demonstrate BitDefender’s ongoing commitment to evolve its offerings to meet the needs of today’s latest applications."
So it's fucking great
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Password : Ferrum