For non-free AV, I prefer Kaspersky Internet Security, myself. NOD32 with Comodo Firewall is my second choice.
For free AV, AOL Active Virus Shield and Comodo Firewall are my choices. Active Virus Shield is made by Kaspersky.
“What the hell did you expect? Leave Vista under the pillow and the OS fairy would make it Win7?” -El Fiendo
“And Bring Mailman back god damnit, he is the Eric Cartman of TPU” -MRCL