I use this, and my company (which is a hardware/software company) also uses this - great program!
I got a pop up here at work about 2 months ago about upgrading my virus protection. I kept closing it and ignoring it, but it kept popping up. I finally called my IT guys and asked if it was a Radiant (my company) program that I needed to allow to run (it wasn't).
They said that most of the viruses that they are seeing these days comes from Facebook apps. You know the ones - the quizzes, etc.