I was try to install the Windows 7 in my acer laptop and after some time in between the installation they asked me about the 25 character Code that is printed on the CD cover. I have entered that and the installation was completed but now i want to know about how the Microsoft checks the Validity and correctness of these 25 character codes. So please provide information on the topic i am eager to know about that and any suggestion will be helpful to me.
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