I am not familiar with either of those programs, but the "Nero giving a distorted output" hints at clipping, although both programs may not handle high gain well (even if not clipping), since they may have a gain stage before print (no idea here, just speculation). It is almost as if Nero is trying to print a clipping situation, while Audio Creator is (over)compensating for it.
Have you checked the exported wav file to verify that is it not clipped? If nothing is found there, have you tried simply burning the audio to CD using Windows Explorer to check?