Personally I use Avast! from Alwil, but the choice is yours.
Addition: Fox News caught up on the story; however, I'm not at all sure how a piece of inanimate code could "go berserk" !
An occasional semi-serious look at bits of the world by a Brit now living in the Colonies. Often taken over by yarny and techy stuff - but then, that's also part of the world we live in. The food is all my own - I cook it, then I describe it here.