There is a very widely known problem which occurs when you install Nero on a machine which
(a) has Adaptec or Roxio Easy CD Creator already installed.
(b) previously had them installed but they were uninstalled by the Roxio or adaptec supplied uninstaller.
Not all versions conflict. v5 and earlier Roxio versions are worse.
Problems can vary from occasional crashes / coaster production all the way to disappearing cd / dvd drives and refusal by burning apps to recognise drives.
Here are some quotes I found by typing "nero roxio conflict" into Google:-
[I]1. Roxio and nero burning rom conflict like two female dogs
Roxio and Nero use two different drivers for their "drag-to-disk" file burning. These different drivers cause all kinds of problems when they're installed together. My computer would present the BSOD when I put a CD into the burner.
My guess would be a conflict between Roxio and Nero. I had this problem before when Roxio was under then name 'Easy CD Creator.' Back then I had to disable one of these programs at boot time to correctly burn a CD. The symptoms are very similar to yours, CD craps out after 100% complete and the leadout takes forever. I would uninstall Raxio, uninstall Nero and then reinstall Nero. Update Nero to the latest version, try burning 2 CDRs one after the other.
CDRW software is famous for not getting
along with other CDRW software. If you install Nero, stick to it
only. Roxio, Nero, and NTI all conflict with each other and should
not be installed simultaneously on the same machine. SOME CDR
programs get along fine with each other......others don't[/I]