what kind of cd or you copying from....copyrighted software cds(games, programs, etc) usually can't be copied or duplicated(as far as i know). I tried doing this with dungeon siege,..but ofcourse nothing happened. Audio cd's however can be copied ...although it may indicate that it is copyrighted during burning.
btw,..i use nero too.
perhaps there's a workaround ...lets see what others have to say,...have you tried copying it to your HD???