since installing windows 8, my dvd/cd drive has gone missing twice from 'my computer' and does not operate.
The first time I was able to restore it by typing the following
reg.exe add "HKLM\System\CurrentControlSet\Services\atapi\Controller0" /f /v EnumDevice1 /t REG_DWORD /d 0×00000001
in cmd under administrator.
This time, it does not work and although the drive is showing up in device manager, ,it has not reappeared in my computer and does not work.