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The product key is specifically for your product, we can't give one out here, but you will have it on your microsoft account as you bought it online.
Go to http://store.microsoft.com
Sign in with the same account you used to purchase Office, and you will then see the key there to use.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Let me know the results please