From the information you have provided, sounds like a hardware problem - especially if you have tried different apps and getting the same result.
Another test you could do is download a live linux version, say Ubuntu to test your burner on CD's, although unfortunately this requires you to write the iso to a blank CD to work (catch 22)! If you could do this (have access to another computer to burn the CD) this could illiminate the OS as a cause of the CD burning problems...
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