Code 19 is a Windows error, meaning there is no communication with the device.
It means you have a registry error or a hardware error with the device. Hard to tell which, but it means the registry returned an "...unknown result..."
It is more difficult to fix than it is to buy a new one, but there may be firmware fixes at the computer or DVD manufactdurer site.
You might try downloading and running Scanreg.exe or other registry rebuilders and tester.
You might also try typing ...scanreg /restore... (without the dots or quotation marks) at the command prompt.
Usually if it is going to be an easy fix, you remove the device, shut down and reboot, shut down and reboot again and use RegClean (download from
www.majorgeeks.com - the one by Juoni Viourno) to remove any references to the registry, then reinstall the optical drive it to re-detect the drive using Add New Hardware Control Panel.
You can also try removing the drive by goint to Control Panel -> System Properties-> Hardware-> Device Manager-> then right click on the CD Rom listing to then click on uninstall.
This will temporarily uninstall the drive. Then you can again reboot, and the computer will detect and recognize each drive as a new drive as Windows boots. It will load the appropriate drives, normally, and re-set the registry.
The next step is to use System Restore to go back to a time when it was working, or reinstall Windows, or install it in Repair Mode (NOT REPAIR CONSOLE MODE) which is what I would do because it is faster in the long run.
If none of these work, your drive is bad. Replace it for less than $30 and go on...
Good luck.