What's the best and the most lightweight...?

I'm sure you'll hear many different results here, but I LOVE my Avast. It seems to update multiple times a day most of the time and when its not doin that i don't even realize im running a AV lol.
I used to use ZoneAlarm Firewall but that was in my early Vista days it seemed to work most excellent without probs. I would only get annoying initially with new progs since it makes sure nothing goes by that you don't want to. Not sure if its 7 supported yet.

Vipre...totally lighter than any other, including Nod32.

But do any of these give you that extra sense of security by sayin, hey you're ok buddy don't mind me im just doin a little update for ya. k, bye! lol That's my made up scenario for what i see when my Avast comes up and says, "Virus Database has been updated."

A320 said:

They all do that don't they? Hey Igster, never heard of Vipre before.

That's their problem. Due to lack of proper marketing and advertisement, many ppl dont even know about Vipre. But try it to believe it.