CD-ROM drive not recognized, error code 19

I recently was servicing a dell pc and the cd was visible in the device manager, but with the yellow “?” indicating to me there was a problem. When I attempted to un-install then re-install I was unsucessful at accessing the drive. Once again I got the “error code 19” that when I googled told me it was a registry error. I need advice as to how to correct this and restore the drive’s operation.