What version of Nero are you using and where did you get it? You should always data burn to CD. Don't keep wasting your blanks on bad burns. Use Nero express, load files, then data burn. And if that still doesnt work then, unistall Nero from add/remove and delete any leftover Nero program folders, and do a fresh, clean install, then try again.

edit to add: dont burn inside your Limewire shared folder. Copy the files you want to burn into a new folder on your desktop in you c drive. Open the new folder that you made and load the files into Nero then data burn. Providing, your OS is Windows XP of course.