Problems to the downgrading of 10 for windows windows 7

I've demoted 10 Windows as my computer is too old, it cannot carry out. Resembles that in the process of the product key for my windows Ultimate edition has been lost.  She asks for the product key. and I again since I already used it. I can't update or anything due to an access denied message (I am the administrator with full control). Is it possible for me to obtain a new product key for windows 7 ultimate or renew the one I already have? Or there is nothing I can do?

If you have lost your product key, you will need to buy a new one.

Tags: Windows

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    Moderator before go Note: IE8.
    -----

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