Question – Can I use product key after I format my computer

Hi,I bought a Windows 8.1 Pro OEM CD Key from The product key worked and my version of Windows was activated. However, today after I formatted my drive and tried using the same product key, I was able to install Window 8.1 Pro, but it said my version of Windows could not be activated. I tried calling the automated activation number but Microsoft was unable to validate the product key. Any advice would be very much appreciated?Thanks,WilliamError code: 0xC004C003 

That sometimes happens when you buy a product key from somewhere else than Microsoft. Have you contacted and asked for a new key? 

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