I use Adaware pro, Zone Alarm Pro, AVG7 pro, and Spybot for several years, and to this day have yet to get a bug. In fact AVG stops bugs before you get them. I use to use Norton, but it lets you get bugs and then tries to deal with them. Spybot has just upgraded and has more features. The teatime feature on it is excellent. I also have MS antispyware, but it still has some bugs and when it pops up with an alert about something changing there is usually not adequate info. They need to work on it some. Since I have never gotten a bug while using the other progs, I have stopped using the MS prog till they get the kinks worked out. I may not use it then either. I feel there is room for all the above mentioned progs. As they say. Beauty is in the eye of the beholder.