The device should record CD and DVD
As it does one it is likely to do the other
This then seems to be a NERO problem.
Which version do you have?
version 5.5 is CD only
version 6. I gather is supposed to do DVD
but I believe had it problems and there is now
another version called 'Nero Upload' or some such.
Try downloading a freeby that does do CD and DVD
such as CDBurner XP Pro 3
This is also on a recent PVA cover disc
This prove it one way or another