Code 19 errors usually arise in case of any malfunction of device drivers. Typically, the devices found in this state are optical drives like CD/DVD-ROM Drive or USB Cards. Non-appearance of CD/DVD-ROM Drives designates this kind of error and results from the corrupt registry values for the applicable registry key.
Have you ever experienced buying a new hardware device for your computer? If yes, you must have carried through a series of evaluative processes to find the right one for you. And when bought, how would you react if your computer is not willing to embrace it.