Windows 10: Windows 10 Pro Key won't activate after setup change

Discus and support Windows 10 Pro Key won't activate after setup change in Windows 10 Gaming to solve the problem; So I bought a license key few years ago, was using it for my personal PC, never had an issue with it. After windows reinstalation all I had to do was... Discussion in 'Windows 10 Gaming' started by Hubert Tomala, Oct 10, 2022.

  1. HUBERT TOMALA
    Hubert Tomala Win User

    Windows 10 Pro Key won't activate after setup change


    So I bought a license key few years ago, was using it for my personal PC, never had an issue with it. After windows reinstalation all I had to do was login into microsoft account. Now after upgrading my setup it wont activate showing error 0xC004C003 on activation screen in settings, and when I try to put a license key it showing me 0x803fa067 error code.I called helpline and they said that this code is blocked, but they cant see reason why. They advise is to contact shop and ask for new key, which is ridicoulus as nobody give me new free code after almost 6 years.I tried many solutions form

    :)
     
    Hubert Tomala, Oct 10, 2022
    #1
  2. FX-GMC
    FX-GMC Win User

    Windows 8.1 pro + WMC key activation

    This worked for me last time with a Win 8 key.

    Install Windows 8.1 and enter KMS key during setup. Once in windows change product key to my Windows 8 key. Go to add features and enter my WMC add-on key. Drink a beer to a job well done.
     
    FX-GMC, Oct 10, 2022
    #2
  3. TIGGER
    tigger Win User
    Windows 8.1 pro + WMC key activation

    So it will be fine installing 8.1 pro with a KMS key, then switch to my 8 pro key and it will activate ok?

    Maybe a daft question but why can't you just install 8.1 pro with the 8 pro key, or is it different keys for 8 and 8.1? seems silly when 8.1 is a free update anyway.
     
    tigger, Oct 10, 2022
    #3
  4. TIGGER
    tigger Win User

    Windows 10 Pro Key won't activate after setup change

    Windows 8.1 pro + WMC key activation

    I was considering buying a WMC pro add on for my windows 8.1 pro install, but have googled and found some people had trouble activating it. Has anyone on here got any experience with this.

    As to my install, I have a real Windows 8 pro key. So I installed windows 8 pro using a MSDN retail .iso which was activated soon as it finished installing , then I updated to .1 pro.

    When you buy the WMC add on, it changes your key, I have read some people have had trouble activating it, now mine activates from windows, I hate doing the phone activation crap, so I don't want to have to do that after the WMC add on finishes installing.

    The question is, what happens to my windows 8 pro key, is it still usable? and how would i go about if I had to reinstall? would it have to be-

    Install win 8 pro-update to 8.1-install WMC add on, or could i use a windows 8.1 pro with WMC disc?

    Thanks guys

    Tigger
     
    tigger, Oct 10, 2022
    #4
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Windows 10 Pro Key won't activate after setup change

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