I tried paid and free and the best so far is the MSE. Reason why it's the best is there's no Blue Screens, always stable and when used with WIN 7 firewall with TinyWall firewall
It seems the 'TinyWall' does the most stopping of the Malware, you can see the 'Blocked Connections' list tab and does it with no pop-ups. Since MSE is free and works good with it's 'Mother Ship' Microsoft it's simple and works.
Try this set-up if you want to compare, it's all free.