By far the most damaging, and lucrative virus this year has been "Windows AntiVirus 2009." This thing is a real b**** to remove. Its actually a trojan, but most users click on it, since it looks legit. Just finished another two hour, ten round battle with a tower. Each time I get a new case of it from a customer, its a little bit different. Its ike the darn thing mutates. Luckily, people smarter than I have created batch files that remove most of it, and then whatever AV program they have will scrub the rest. Just takes a looooong time to get it done, and invariable the infected machine is wildly out of date. My favorite line from the customer (usually the woman of the house), "My husband never goes gambling or porn sites." Uhh, yeah right lady ;D