Well do you know which brand & model of dvd burner device you have? Knowing those 2 things are important. Then you can google the address of their site, go to their customer support section & look for firmware upgrades for your particular model.

The same applies to Nero. Check their site for updates for your version of Nero. AFAIK only Nero version 6 & 7 can burn to dvd's. Or perhaps also the later versions of Nero 5.