Personally, I wouldn't bother. I already had Spybot S&D installed before I uninstalled AdAware and installed SuperAntiSpyware, so I left it alone, otherwise, I wouldn't have bothered as I don't think it is going to catch anything that SuperAntiSpyware isn't. Let's face it, if we wanted to we could fill up a hard drive with security programs, but we wouldn't be any more protected than we would be by having one decent one/