I never install anti-virus on any of my computers, but that is because I do not have anything worth anyone taking on my computers.

But instead what I do, is look at applications that have huge security risks and I don't install them. That is still not as secure as an anti-virus software because it does no protect me from internet threats. But I have nothing of value, so why waste resources?

I have a lot of friends that would highly recommend clamav tho.