Attached Link: http://www.sysinternals.com/blog/2005/10/sony-rootkits-and-digital-rights.html

From Shell Extension City...

"Sony's controversial hidden rootkit automatically loads into your machine when you put a newer Sony music CD in your computer. The software will break your computer if you try to delete it, uses 2%-3% of your CPU overhead at all times (whether you're playing the disk or not), and creates a vulnerability allowing others to install permanently cloaked (hidden) files and programs on your machine."

This is nasty stuff. The only complete solution seems to be submitting a request to Sony for an uninstall package.