Burn a cd

Question

i have windowa media player 10, i used to be able to burn cd,s with it but now it will play cd,s but not burn ?
the message says WINDOWS MEDIA PLAYER CANNOT BURN TO CD BECAUSE 1..DISK MAYBE DIRTY---DONE THAT
2..TRY DIFFERENT BRAND OF DISC--DONE THAT
3..TRY AT SLOWER SPEED------DONE THAT

PLEASE HELP