i had a similar problem, nero just refuses to burn no matter what, I had nero 1.3.0.00. After losing a lot of sleep and a lot of hair, I finally did the following
1 remove all traces of nero from your computer(search for it and delete if it wont uninstall)
2.updated to nero 184.108.40.206 which you can find at www.oldversions.com
Or at Torrentspy.com(which I recommend buddy)
Theyre are demo versions so after 30 days of trying it, youll have to pony up the dough!