My laptop's infected.
I've been working on it for two days or so, and it's currently undergoing a very, very thorough scan finally.
I hope it'll get rid of the stuff. It's part of the trojan.vundo family, and has apparently already replicated itself a number of times, so every time I use the laptop it tells me of 200 more instances in which it was found. Hooray.
I hate bad Internet users.