strange dvd thing?

i just bought acer 5534-1096. its working perfect even its dvd drive also working fine but there is something wrong wiht it...it allows to read content from cd's or dvd's but when ever i try to write something it says no cd/dvd in drive.(Magic ISO message)
but
but
on the other hand windows 7 shows the message "burn dvd/cd"

whats wrong with it?????its says super double shiit on drive.....
 
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