Recently my DVD drive on my Vista machine was not visible any more. The device-manager told me that the driver could not be loaded. I had no idea what the reason was. However this is the solution I found on the net:
- Open regedit
- Navigate to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass {4D36E965-E325-11CE-BFC1-08002BE10318}
- Delete all keys named “UpperFilters” and “LowerFilters”
Done.