Media Player, listening to music after its been burned!

I always use media player and havent had any problems since recently, I've
burned two cd's which have worked fine on my computer and I can listen to
them fine but when I try and listen to them in my cd player they don't work.
Can anyone help me? Before anyone suggests yes the player is compatable with
cd rw. I have burned cd's on media player before without any problem, what
can anyone suggest?

karedoyley