take the cd out.... wait a min... put the cd back in and hold the shift key while you are putting the cd in. hold in shift for about 20 seconds after the cd is in too.

then try playing it like you tried.

Might have to reboot. They say it's just a memory residant program that exits when you take the cd out.. but some people said they had to reboot for it to go away. The program prevents you from doing what you were trying to do.