Once the root kit is there, any file name that begins with $sys$ will not be visible to the windows API.
So, you play a Sony CD, then rename notebook.exe to $sys$notebook.exe that file will disappear.
The end result of this, if sony continues to illegally install root kits with every CD autoplayed in a PC, will be hundreds of thousands of rootedPCs connected to the Internet, ready for exploitation.
Got a fire wall ?
Got anti-virus ?
None of it will matter because every time someone takes a Sony CD and puts it into the CD drive, it's set up to autoplay, which installs a new root kit with every play of the CD.
That's why it matters. Sony should be brought to court for their actions right now.
Ummm... why haven't you disabled autoplay yet?
I'll just make sure never to buy any.