I did buy it. In fact, I pre-ordered it.
Mike,
I won't tell you how to do it in the registry becuase an inexperienced user can do a lot of damage there.
However, can can accomplish the same thing by doing the following:
Open my computer
Right click on your cdrom drive
Go to properties and left click
On the autoplay tab highlight music CD and select no action
Highligh mix content and select no action.
Left click apply
Turning this off will prevent any music cd's from launching media player when you insert them in the CDrom drive.
Good luck,