I have two of the LG GSA-H62L in one computer.
HL-DT-DVDRAM GSA-H62L ATA Device
Niether drive is visible in Windows Explorer.
Error Code 19 shows up in my Windows Vista Device Manager.
It appears I need a driver. Not so.
The solution is at:http://support.microsoft.com/kb/929461
Upon reboot it may initially appear that the problems still exists because drivers cannot be installed. They are atually already there. Look for the drive in Explorer.
The problem is a result of removing programs and possibly programs that came with your DVD device.