No, Windows.

I use Opera browser, for which there is fewer exploits (and least commonly used due to Opera's tiny marketshare). If I do get any viruses, or anything, I can get rid of 90% of them without the use of AV software, anyway.

Same here, we used to get Norton every year or two.

I use ESET Nod32 on my laptop and my desktop uses AVG 8.5

I don't have one at the moment, but we are just changing internet supplier to O2, and they are giving us McAfee, so I will probably use them

Same here I use Opera and have no AV software and use Windows. 

Viruses are slowly dying out. If you get a chance to compare traffic logs on servers, you notice that virus activity has been down significantly between the past of even two years ago and the present.

These days you're guarding less against viruses and more against mal/ad/spy-ware. At this point all you really need is a brain, a browser that limits scripts, and a firewall.

I run Eset NOD32 on my PC but it really only exists for those times when I know I'm pulling a file from an untrustworthy source.

I hardly get viruses anymore. Instead, I have adware on my laptop and it bugs me everytime I click on a link in a search engine. If you have adware on your computer, download NoScript. It's an add on for firefox and it limits scripts in a page and so far I've had good luck with it. You may need to make exceptions whenever viewing flash or javascript, such as Youtube, Myspace, or here.

Nod 32, the best antivirus software I've ever used.

generally none but when i'm feeling frisky avast

I use AVG and am very happy with it.