Unable to burn my music to a CD or DVD??

I submitted my question already but I wanted to quote the pop-up message that I receive when I open iTunes. "Registry settings used by the iTunes drivers for importing and burning CD's and DVD's are missing. This can happen as a result of installing other CD burning software. Please re-install iTunes." Like I said in my previous post, I follow the instruction on uninstalling all of iTunes, Quicktime, Bonjour, etc. Everything uninstalled. I reinstalled iTunes and I get the same popup. What should I do?