are you trying to burn them as just data discs or as actual dvds. if its actually dvds you will have to convert them to mpeg and would be better off trying to aquire a copy of the dvds the xvid copies were made of. if your just trying to burn them onto a data dvd then make sure you selected data dvd as the type of disc you want to burn and not data cd.
also, MagFan is making new versions of these on dual layer discs i believe.
-Darth Simon