What anti-virus software do you use?!

What anti-virus software do you use and is it very protective, free, and rate it..

I just want to know which software users mainly use...

AVG Free
its really good tbh, i dont know much about it but it does the job :P

Also AVG free, it's perfect :)

Microsoft Security Essentials, it's silent, hidden, automatic and MS know Windows better than anybody else.

i've used loads in the past but atm i'm using avast! and it works perfectly :)

norton internet security

AVG Free, I would rate it 8/10 & it is protective imo

ESET Smart Security, then I tried Kaspersky, now I've gone down the free route of Comodo Firewall with Avira.

All of them were brilliant, will probably go back to ESET SS.

I've heard incredibly good stuff about Microsoft's Security Essentials, it's meant to rival even the paid one's. Definitely the choice if you're going down the free route from what I've read on technology websites.

I use NOD32 and have done for over 3 years without a problem :)

Avira AntiVir, Comodo Firewall and Spyware Terminator with Spyware Blaster. I used to use avg but the new one is becoming resource hungry and bloated