are your sure ther dvd drives for starters. silly question i no but a easy mistake. second of all try looking for starforce as this is renound for screwing up cd and dvd drives and just general messing up your pc as iv discovered recently with one game. to check for it...
1. right click on my computer and click properties
2. go to hardware tab and click on device manager
3. go to view and click show hidden devices
4. expand non plug and play drivers
5. check for any referance to starforce
if you find it dl the removal tool of the net and run it and reboot and if your lucky it will be gone. it does not work for all aparntly but has worked for me so far.