Microsoft AntiSpyware
I started beta testing the GIANT AntiSpyware software. I admit, my expectations were low having used some of the other stuff our there. However, I was BLOWN away by how nice a piece of software this is. Not only does it protect you from AntiSypware but it tells me what the heck is going on with my computer. I love knowing when applications are adding themselves to the Startup process, adding Contextual menus, modifying x, y or z. It just leaves me feeling like I'm in control of my PC when installing programs.