Ok is your DVD not reading DATA only or is it not playing dvds either?
If its not playing DVD's then make sure you have somthing like power dvd installed.
http://www.cyberlink.com/multi/download/trials_1_ENU.html
Also Im sre you check this but make sure your Drive is minimum a Dvd R. If not oops thats the prob.
Give me more details and I can get you helped out!
