I have a Dell Dimension c521 computer with a DVD RW burner. I am able to burn DVD-R’s without problems with my nero burning software but when I try to burn a DVD-RW disc it says illegal disc? I’m new with burning DVD RW disc and maybe I need a different type of burner for these discs? I’m sure I left out information that is needed to help me, so please let me know what else I need to provide. Thanks.