Another example of why DRM and the big corporations are not to be trusted in your computer.
This guy played a Sony copy-protected CD in his computer and it installed and tried to hide a rootkit. The arrogance of these companies in believing they can can install software, (apparently poorly written, draining system resources, and very difficult to remove) in the guise of protecting their revenue streams (trans: exploitation of artists who don't know any better).
The sooner that the "recording companies" are removed from the relationship between the performers and their audience, the better.

UPDATE: "Virus writers have begun taking advantage of Sony-BMG's use of rootkit technology in DRM software". That didn't take long, 'though hardly surprising considering the publicity.