I have just tried to use 4 different dvd-r and cd-r discs that I know my computer is alredy compatible with (dell dimension 4700) and my disc burner won't recognize any of them. Everytime I try to double click on the disc image it says d:// is not accessible , incorrect or invalid function. Its never done this before. It will recognize some dvd-rw discs that I have burned previously. Whats the problem?