I have a Toshiba Satellite P775-s7215 that is operating on Windows 7 Professional.
I tried the "regedit" solution re: deleting upper and lower filters with a reboot, but no luck. Now there are no upper or lower filters in that registry and the computer still does not recognize the DVD drive (which spins as if it is reading a DVD when a DVD in placed therein).
A DVD drive does not show up in device manager.
Thanks in advance for any help.