Windows has more virus than a Mac cause there are more Window users. All anti-virus has some security flaws but some more than others. I used Norton before but it took up wayyyyyyyyy to much resources so I turn to McAfee is a bit better but still has it's flaws.
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Perhaps I've been lucky, but I'm getting by with the free version of AVG... Everyone in the family knows that you don't click on unknown links in e-mails or open file from people taht you don't know... And always run the latest version of Firefox with noscript...
AVG Free here as well, it has worked for me since I gave up on the Norton Bloatware several years ago
Microsoft Security Essentials here on my Windows boxes.
Kryspy
1) Samsung PN50B530 Plasma, Shaw Direct DVR-630,PS3 Slim, Pioneer VSX-815 7.1, Harmony 880
2) Toshiba 32AV500 720p LCD, Shaw Direct DVR-530, WDTV HD Live, Harmony 700
My anti virus is best then others,it is more protect my PC.