1.    11 Sep 2015 #1
    Join Date : Apr 2014
    Posts : 10
    Windows 10 Home

    windows 10 Error code: 0xC004C003 after clean install

    after upgrading to 10 from 8.1 *not a clean install* windows performance was quite bad
    i downloaded windows 10 iso from microsoft website then installed home edition as i was told here it won't ask me for a key and if yes i would be able to skip it and it will activate automatically when connecting to internet
    not it asks me to activate with this error code
    Click image for larger version. 

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    windows 10 FAQ says i can reinstall or clean install without having to enter a key
    Windows 10 FAQ Tips - Microsoft
    Click image for larger version. 

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    what a mess
    can you help with it ?
      My System SpecsSystem Spec

  2.    12 Sep 2015 #2
    Join Date : Jul 2015
    Posts : 2,552
    10 Pro

    First try slmgr /ato from a command prompt - it might (but most likely will not) work.

    If that doesn't work type slui 4 from a command prompt and follow the instructions for phone activation. Eventually you get through to a real person. If you get someone who says "there is currently a technical problem with our servers, please wait a couple of days" then hang up and immediately try again. Eventually someone will activate it for you.

    It took me 3 or 4 calls but eventually I got a new Windows 10 key after my third clean install on the same hardware failed with the same error as you.
      My System SpecsSystem Spec


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