i have tried to burn cd's on several freeware burners and one bought program. they all do the same thing. it will start burning and part way through it will give an error message and the disc is messed up and can't be used again for music. all my music i have i think is mp3. does the music have to have a certain file extension or something. it seems when i first downloaded some of this music i did burn a cd. then i think i changed all the files to mp3's. i know nothing about this stuff. it has to be something simple. can anyone help?