I use nothing... Cause, when I use protection I cant "Feel" the internet baby!
In all seriousness... Im using Avast atm. But increasingly I am becoming dissatisfied with Avasts performance. AVG is obnoxious with A: having entirely too many running processes, and B: no way to shut them off on the fly.
I also use Malwarebytes, which I am convinced is still inferior to Adaware, but cant yet prove it.
And I will also run Peerblock which is a wonderful program to keep people who might use my computer, from looking up blatant spyware/adware "Hey this page looks like a newspaper website and it was one of the higher results on google... So what if the URL name has nothing to do with the content in question" advertising sites, (Yeah, not fond of letting others use any PC I admin) its the closest thing Ive found to a viable firewall to replace Sygate since it died.