Hmm... Nero Enterprise. I wonder if that's different from the regular versions of Nero. That might be why our explanations aren't making sense, but I'm not sure.
At least in the regular version of Nero, there should also be a drop-down list (on the Burn tab) with a label next to it which says, "Write Method". You can choose Track-At-Once (TAO) or Disc-At-Once (DAO) from this list. For best results, choose Disc-At-Once and click the "Finalize CD" checkbox.