I'm not too confident about entering the Registry
However I have had a look at the link you sent Snooker. It seems that by deleting some CD-Rom copying/writing software that this has come about. Well I had a copy of DVD Unlimited on my PC and recently Norton was picking it up as having a problem or two so I deleted it having never used it anyway. I suspect that this must be when the CD-Rom and DVD drives went "missing".
Also in the list of instructions it says to locate the "Upper Filters" and the "Lower Filters" - not sure what these are and I could only find one instance of the file mentioned so as it is I daren't proceed.