Apart from the obvious that something is failing in the CDR............. like you, I'm hoping someone will come up with an answer. I don't have a problem, but like you I have W98SE, Nero and a Lite-On so I am mighty interested.
Assuming that the CDR has not reached the end of the road it is possible that Nero somehow is corrupted and in typical Windows fashion, un-installing did not remove the faulty code from somewhere so that reinstalling did not overwrite the error.
I realise this is a long way round, but perhaps another uninstall followed by a comb through the registry "finding" and deleteing everything which responds to Ahead or Nero?
Bringing this thread back into play can't be bad!