I have to agree (except for the part bout Kas being top notch) - but if you singularly rely on only one anti-malware program, you're beating a path towards crippling yourself.
Having one anti-malware and firewall program run while you're just browsing online is fine, and a really good program will spiderweb 95% of everything you run across . . . none of them are fool proof. Not every software developer is up on every single definition - and some have definitions that others don't just yet. Scanning your rig should be as much of a routine scheduled thing as defragging your HDDs and cleaning your registry; and when it boils down to scanning your system for any potential infections, you should have your Rambo anti-malware, and possibly one or two other really good freeware programs.
Point in fact, I use Trend Micro PC-Cillin Internet Security 2008 suite, which runs as a constant anti-malware when I'm online, and replaces WIN firewall, also . . . for a once a week/month scan, I also use Webroot Spy Sweeper and Anti-Virus, and Windows Defender. Last scan I ran, Spy Sweeper flagged 6 files that PC-Cillin completely overlooked. PC-Cillin is an outstanding program that catches every major virus and common spyware, and never gets irritating with pop-up flag windows, but it still overlooked a couple of temporary internet files that were questionable.
Look at it like a countries homeland security . . . if you only have one branch of military, you're still left for attack if they're chillin in boats defending the coast . . . add a branch of military that can defend the skies, and you're lookin even better . . .
