Did you go to REGEDIT to see if you have a corrupted registy?
Follow these instructions VERY CAREFULLY BELOW:
1) in COMMAND type REGEDIT
2) CLICK on HKEY_LOCAL_MACHINE
3) CLICK on SYSTEM
4) CLICK on CURRENTCONTROLSET
5) CLICK on CONTROL
6) CLICK on CLASS
7) VERY VERY CAREFULLY: CLICK ONCE ON THE FIRST REGISTRY FILE FOLDER RIGHT UNDER THE WORDS CLASS
8) Using the up and down keys on your keyboard: move the highlight down the list SLOWLY until you see the Title "DVD/CD-ROM DRIVES" on the RIGHT HAND SIDE OF THE REGISTRY EDITOR UNDER THE WORDS DATA.
9)VERY VERY VERY VERY CAREFULLY ERASE ONLY THESE FOLLOWING WORDS:
ANYTHING THAT SAYS LOWER FILTERS AND ANYTHING THAT SAYS UPPER FILTERS
After that close all windows and reboot the laptop
Check the dvd drive again with a dvd movie and an audio cd and a software program.
If everything works, the issue was just a corrupted dvd registry, if it does not work please write me the results.
I hope this helps :)