Is that a question or did you really disable some service, you shouldn't be messing around with those stuff though, make sure you enable it back to default.
Let me ask, is this DVD drive new? Did you install it yourself or did it come with your computer and was working before? Also, have you tried the CD or DVD disc on another computer to see if the media isn't corrupted or actually full? Not saying your an idiot or something but just wanted to check.