I recently reinstalled windows to find my usual D drive for the DVD and the E drive for the RW DVD had became H and I drives! In windows you can assign a letter to the drive but when I've tried it the letters start at H and end at Z for some reason A to G don't exist! The drives still work fine but I can't understand what has happened. Sorry for being not much help but I do symperthise!
skaria once you have removed the drive the system will detect it automatically and go looking for drivers for it(if it doesn't try a restart). If you don't have the DVD driver try a google search for a free DVD decoder.