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I have macbook pro, I have two problems, first my app store gives error "could not complete your purchase, unknown error" and also my account cannot sign out. 2nd I cannot save anything to HD, it gives error "you do not have permission to save file to HD". Although I have just admin account on my macbook pro. Please solve my problem

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Restart our MBP and make sure you are logged in as admin. –  Buscar 웃 Apr 21 '13 at 20:18
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