Windows 8 and 8.1 Forums

Help: Trying to make custom win 8.1 iso

  1. #1

    Bihar, India
    Posts : 7
    Windows 8.1 x86

    Help: Trying to make custom win 8.1 iso

    hi there,
    i have created a custom install.wim of win 8.1 pro using windows pe usb drive and sysprep generalise option. when i run my new setup and enter key it says "this key doesn't work with this edition of windows. try a different key". But i have tried all edition generic keys but none work. I also tried creating a ei.cfg file, but then it says "setup has failed to validate the product key".
    Please tell me how to fix this. (sorry for bad english)
    Thanks in advance............

      My System SpecsSystem Spec

  2. #2

    Posts : 333
    Windows Server 2012 R2 / 8.1

    Hi Himashuk27,

    Check whether you are using the correct ISO and possibly use your product key to download the media you need:

    Windows 8 and Windows 8.1 ISO - Download or Create

    Is it possible your product key is an upgrade license?

    if it is an upgrade license it will not work straight off the bat, this was windows 7 workaround although I do not know if it will work in Windows 8 I have not Tried it:

    You need to open a run box and type: "Regedit"

    Then located this key:


    And find the one called "MediaBootInstall".

    Double click that and change it from a 1 to a 0.

    Then open up cmd as an administrator

    Type the command "slmgr /rearm"

    You will get a restart your computer messge.


    Then when your computer restarts you need to open a run box again and type "slui.exe 3" and it will allow you to enter your product key and activate
    Have you tried creating a windows 8 wim ?
    Last edited by Harrylowt; 26 Feb 2014 at 02:58.
      My System SpecsSystem Spec

  3. #3

    Posts : 2,191
    Windows 8.1

    If Harry's suggestion doesn't work, the key to this not working may lie in the word "custom." Things added, removed or changed may alter one's ability to use a generic key. Just a thought; however, I'm guessing a non-custom ISO (eg, standard issue) might work just fine but I can't say for sure. Anyway, consider it as food for thought.

    Good luck,

      My System SpecsSystem Spec

  4. #4

    Bihar, India
    Posts : 7
    Windows 8.1 x86

    the regedit fix worked for me,,, thank you all.
      My System SpecsSystem Spec

  5. #5

    Posts : 333
    Windows Server 2012 R2 / 8.1

    Our pleasure all the best best with your future custom iso projects

    have a great day.

    cheers, Harry
      My System SpecsSystem Spec

Help: Trying to make custom win 8.1 iso

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