Hello,
Please try this :
Open the registry under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class
[to open the registry, vista or 7, navigate to start, then type in regedit, choose from list, right click and say open as administrator. On XP, navigate to start, choose run, type in regedit and hit enter]
Then find the DVD & CD ROM key under above value.
Under the DVD & CD ROM key, find the values UpperFilter & LowerFilter and delete both seperately. Reboot machine and recheck. See below for picture