Hello,
I have seen some of the replies that have been posted, however most of those replies are solutions to a problem that you don not have which is an existing CD drive that is not working or faulty,
The problem that you and many others myself included have is that the laptops do not have a cd drive, they never did. we all bought them without one. the solution to that I believe is to go to Dell and order one. you can install it yourself. its a matter of taking out the empty shell and inserting your new drive. that will solve the problem.
Note: be sure to get on that is compatible with your laptop.