Missing CD/DVD drives: solution?

Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39) « Barugon’s Cave (^_^): "A few days ago I ran into an issue where my DVD drives no longer appeared in Windows and were not accessible either. What was strange was that I have two physical DVD drives (a DVD-RW and an Xbox HD DVD drive), as well as a virtual drive provided by Daemon Tools for loading ISOs - yet all three were highlighted with an exclamation mark and the same error code: Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)."