DVD burner

All of a sudden my dvd-burner decided that when i put in a blank dvd, it wants to be a cd station. When empty it reads as a nec dvd burner, but as soon as a blank is inserted it reads as a cd-station.

running XP professional - fully uppdated
Any ideas?

Just a random suggestion but are the disks the right ones, i.e. +/- depending on what your burner is?