Being an IT professional doesn't say much imo, sounds more like making a commercial, I myself use the free versions of Spybot and Adaware in Combination with free AVG antivirus, for me that is more than enough protection on my pc as I'm behind a router.
Also I don't like the idea of running more than 2 programs that do almost the exact same thing, but adaware and spybot fill each other up pretty well I must say, expecially for free software!