can't playback my burned cd's using nero!

hi and I hope someone can help me with this! I burned a few cd's using my nero startsmart and chose the create audio cd, ripped then played it just fine on my computer but when I put it in my 2004 touareg I just got it says "cd error" so I burned a disk using windows media and it played great in my car but since I can't burn with windows in mp3 mode I can't fit that many songs at all on the cd! is there a way for me to burn some other medium on my nero so it works in my car and if not, how do I butn more songs on a cd using windows media please? thanks for any help!