Product key not working. Error Code 0xC004E003, please help.

[I_ButteryMe]

Hi, I had a working product key that was genuine and was working,but then when I was upgrading to Windows 10 my Electricity went out. It said that it stopped the Installation of Win10. Then when I checked my Product Key it was de-activated. And my real product code isnt working anymore. What should I Do. Please answer. Thanks.. PS: SLUI 4 phone activation doesnt work, instead it comes with the windows 7 ultimate key you have typed is invalid for activation. Also I have windows 7 Ultimate. Error Code 0xC004E003.

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