can anyone actually help me?

why, on my limewire,has it recently when i have completely downloaded the file and tryed to burn it to a cd it wont register on the burner?i just bounces back as if it hasnt been downloaded properly it just wont allow me to burn it,anyone got any ideas?i have posted numerous posts before but no-one at all has replied.i am running limewire on g4 power mac 9.2.2

also i have run system tests on my burner and it is running fine.

captain.