The registry settings used by the iTunes drivers for importing and burning CDs and DVDs are missing . . .

Lately, when I launch iTunes, I get a small pop-up on the desktop that says "The registry settings used by the iTunes drivers for importing and burning CDs and DVDs are missing. This can happen as a result of installing other CD burning software. Please reinstall iTunes."

I haven't installed any new CD-DVD related sofware. I did follow the complete procedure for removing all traces of Apple software, and reinstalled iTunes. No change. I have no problem editing the registry if someone will tell me what to fix.