Try removing the CDROM in Device Manager, rebooting, and see if Windows puts the driver back again.
Sorry to say the CD might be dead, but you have to cross check as many ways as you can to be sure.
Another check is to watch and listen. Does the light come on at all, and can you hear the disk spinning up at all - as well?
Assuming of course that you haven't been inside the box and disturbed the power and data cables. Even with a non-working laser, the disk will probably give a brief spin before stopping and developing "cloth ears"