drivers for your cdrom drives might be corrupting, sometimes atapi drivers and soforth can spack out.
that should solve it, if it doesnt swap them over in the machine and dont forget to set the jumpers.
if the drive is faulty you can always replace cd burners for about $25Australian or $70 Australian for a duall layer 16x DVD burner/CD rom burner
If no-one gives your an answer to a question you have asked, consider:- Is your question clear.- Did you ask nicely.- Are you showing any effort to solve the problem yourself 