I’ve come across this new breed of popup ad a few times in the past couple of weeks:

Yet again we have an attempt to prey on the gullible and less-than-well-informed computer users. What infuriates me most about this—even beyond the desire to trick the user into thinking his or her computer has a problem (much like the “Your Internet connection is not operating at full speed†garbage ads)—is that the ad site claims the user’s computer is infected, regardless of the fact that the user’s computer (like mine) might be patched or firewalled and completely invulnerable to the RPC worm.
I wonder how many people have been duped by this scheme? This makes me very angry indeed.
Folks need to learn to differentiate between a scam advertisement and a real security threat, and this sort of schrecklichkeit is abominable.
And a Final Rant Is Due: Look, if you’re going to have a computer connected to the Internet, or even just receiving e-mail of any kind, you must install some good antivirus software and keep your machine updated with the latest security patches (which means running the Windows Update service for most people). Do not use McAffee because it stinks—you’re much better off with Norton Antivirus. Do update your virus definitions at least every week, and run a full scan that often as well. If you can’t afford Norton AntiVirus, try one of several free alternatives, such as BitDefender, Avast, AntiVir, or AVG Anti-Virus.