The discussion and dispute of the best antivirus is seemingly a non-ending story. I think the only true solution is to have some security software running. Personally I have ended with Avast Internet Security, payed version, I first payed for a one year license, and lately I payed for a three year license - the cost is like a cheeseburger or two slices of pizza per month, or ten kilometers of fuel with my car. A big deal?
I mean, what is the worth of safety? Where do people put their money? A few bucks per month... and I have no doubt about people who think Windows' present safety is safe, with present programs.
An issue of values, I would say.