Kaspersky - Top Product in OCT 2013 AV-TEST
Several free and subscription based AV products were recently evaluated by AV-Test
QUOTE: Sometimes it seems like there's a tradeoff; if you want the best protection maybe you have to accept a little performance drag. Kapersky has managed to excel in all areas. It earned the maximum possible score overall; first time I've seen that. You can view the full test results on the AV-Test website.