> Believe it or not, Microsoft Security Essentials is quite good. I use that combined with Malwarebytes. MSE has real-time protection. The free Malwarebytes doesn't. So there's no conflict if you use both. They are compatible and both are free.
In the last year I've been using MSE and licensed MB, and I've had no conflicts. Sometimes MB slow my machine down, but none of my machines is newer than '07-8.