You're infested with "Transponder" spyware!
Your computer is infected by Blackstone Data Corporation's Transponder
spyware product, also known as VX2, RespondMiter, and Sputnik. You
probably got it while installing dodgy software such as Audiogalaxy
Satellite. It pops up annoying ad windows such as this
one, hawking all sorts of crap you don't care about. It also collects
personal information from your computer.
here for more info on this spyware and easy-to-follow removal instructions.
This message is brought to you by Jane of CounterExploitation, who
reminds all sleazy spyware vendors to change the default passwords on the
administration software they install on their servers.