I'm going to assume here that it's the Zune software trying to rip the music?
Check your autoplay settings. If you've not got it selected in the Zune software, Autoplay is the next culrip.
Not sure what OS you've got, but it should be in Control Panel > Hardware and Sound > Autoplay.
It should be one of the first options, Audio CD, and I'm willing to bet you've got Rip Audio CD with Zune selected.