Cant remember whether some did it/some didnt, you should get the latest NForce drivers from that link I posted as cd ones are normally out of date.
You could try turning on/off auto insert notification and see if that sorts it out, just get
Tweak UI goto the "my computer" part in it, then to "autoplay" then "types" and tick/untick the "enable autoplay for cd/dvd"
This might not help at all but its worth a try.