Cd/dvd drive not reconized

My laptop running vista crashed, I had windows 7 installed by a teck. (or so he says) now my cd drive wont work. What can I do to repair this? I dont know to much about computers. My laptop is an acer aspire 5520-5147.
 
Go to Acer's website and find your exact model. They may have updated drivers for your system and Windows 7.
 
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