Windows 10: You must use a valid product key to activate Windows – 0x800704cF

Discus and support You must use a valid product key to activate Windows – 0x800704cF in Windows 10 News to solve the problem; [ATTACH] Windows Activation system keeps checking for validity of your key from time to time. Assuming you have a genuine key and all of a sudden you... Discussion in 'Windows 10 News' started by WinClub, Nov 9, 2018.

  1. WinClub New Member

    You must use a valid product key to activate Windows – 0x800704cF

    WinClub, Nov 9, 2018
    #1

  2. windows 10 says it can't validate product key

    When I upgraded my windows 7 with win10, it says it cant validate my product key? Why? Can you give me the steps to follow to validate it?
     
    aphrodite.soft, Nov 9, 2018
    #2
  3. Superfly Win User
    Product Key


    Keys are not required for the upgrade process. Windows 10 has a built-in generic key which it uses to install - it acquires the underlying Win7/Win8 activation during the upgrade process and assigns your device ID as a valid Windows 10 activated device. Subsequent installs will thus activate using your device ID. You will not require a key - should you be prompted, select "skip". Activation is automatic thereafter.

    See step 6 here: https://www.tenforums.com/tutorials/1...n-install.html


    You must use a valid product key to activate Windows – 0x800704cF [​IMG]
     
    Superfly, Nov 9, 2018
    #3
  4. You must use a valid product key to activate Windows – 0x800704cF

    Valid Win7 Product Key not accepted by Win 10 upgrade


    Hi,

    I did not realise I had been at all vague, my apologies.

    Unfortunately my neighbour now has his laptop back as I got nowhere. I have suggested he wait until the windows 10 upgrade system makes it available through windows update (it is in the queue).

    As stated, I have tried running from the media created by the media creation tool to a USB (this is what I used to successfully upgrade my laptop and surface Pro). I have also run the media creation tool and opted for it to upgrade directly rather than save the files.

    The operating system is Win7 Home premium OEM version. The key is valid and I re-validated it to be sure with the MS online actvation system. The laptop is 64-bit.

    On each occasion it goes through the initial install steps and then gets to the screen where it asks for the product key.

    On this screen there is no skip option and as the product key is not accepted, the only option is to cancel the install.

    For some reason the upgrade seems to be taking a different path on this machine and does not give the skip option.

    Regards
    Mike
     
    mikepaterson, Nov 9, 2018
    #4
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You must use a valid product key to activate Windows – 0x800704cF

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