Security poll. What anti virus do you use ? and do you pay for your anti virus or use a free one?

I'm not asking about any additional software by the way like mbam, superantispyware etc so no need to mention those.
im only asking about what av you use

i am using a light every efficient one called microsoft security essentials
ive used a few in the past and this one is up there with the best
5 answers 5