Autorun not working when CD/DVD in drive

Hi all, I have an Alienware M17x (for over a year now) and all of a sudden I have a problem with my DVD drive. Whenever I insert a CD/DVD, nothing happens. But when I go to My Computer, I see the name of the DVD and when I double click it, I get access to the files. The problem is the autorun. How can I get autorun up and running again when I insert a CD/DVD :confused:? Thanks