Another thing to remember is any Automatic Updates you allow.
On most software, I enable Notification ONLY & do the Update when I want.
This way it doesn't occur while I am working on something; I know when the change gets done; & I download most stuff & keep back copies so I can rollback a change!
I hate Nero! I think it is a crappily written program when it comes to working with LightScribe.
But to be objective you could uninstall everything that is Nero and then trying to burn a LightScreibe label to see if it is or isn't Nero's fault.