I'll give a link but first it may be impossible to diagnose the machine with only the details you provided.
Read this link about this known problem.
http://www.cdrfaq.org/faq04.html#S4-37
Bob
When I insert a blank CD-R, the cd becomes an audio cd with a track 00. Now i can't burn that cd. I checked that same cd in a another computer and it was blank! what is wrong with my computer?

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