lost product key need new to install hardware fix

JOHN EDELMANN 0 Reputation points
2026-10-23T18:43:08.3533333+00:00

lost product key and having hardware issues and need to reinstall

but after i fix or replace hardware

Windows for home | Windows 10 | Licensing and activation
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  1. Ivan B 126.9K Reputation points Independent Advisor
    2026-10-23T19:26:26.0433333+00:00

    Hi,

    If you still have the PC that has this key, you can download ShowKeyPlus to note down your 25-character key.

    https://apps.microsoft.com/detail/9pkvzcprx9nv?hl=en-US&gl=AO

    Please keep in mind that if you have an OEM license, you will not be able to reactivate Windows using that same key if you change the hardware—specifically the motherboard.

    Let me know.

    Thanks

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  2. AI answer

    2026-10-23T18:43:45.43+00:00

    You usually do not need a new product key: prepare the existing Windows 10 digital license, reinstall the same edition, and select I don’t have a product key during setup.

    Before repairing or replacing hardware

    If the computer still starts:

    1. Open Start → Settings → Update & Security → Activation.
    2. Note whether the installed edition is Windows 10 Home or Windows 10 Pro.
    3. Confirm that Activation says Windows is activated with a digital license linked to your Microsoft account.
    4. If it only says Windows is activated with a digital license, sign in with an administrator Microsoft account and use Add an account on the Activation page.

    Linking the license before changing hardware enables reactivation through the Activation troubleshooter. The edition installed afterward must match the current edition exactly—for example, a Home license cannot activate Pro. ^1^

    Also back up personal files before proceeding. A clean installation deletes files, applications, settings, and manufacturer customizations. ^2^

    Reinstall Windows 10 after the repair

    1. Create official Windows installation media on a working computer.
    2. Start the repaired computer from that USB media.
    3. When Setup requests a key, select I don’t have a product key.
    4. Select the same edition previously installed: Home or Pro.
    5. Complete installation, connect to the internet, and sign in with the Microsoft account linked to the license.

    Windows 10 should activate automatically when the matching digital license is recognized. ^3^

    If activation fails after replacing hardware

    A storage-drive, memory, or similar repair may not prevent activation. Replacing the motherboard is considered a significant hardware change and may require reactivation.

    Go to:

    Start → Settings → Update & Security → Activation → Troubleshoot → I changed hardware on this device recently

    Then:

    1. Sign in with the Microsoft account previously linked to the license.
    2. Select the applicable device from the list.
    3. Mark it as the device currently being used.
    4. Select Activate.

    The troubleshooter is available when Windows is not activated. ^1^

    If there is no digital license

    How Windows was originally obtained determines the remaining option:

    • PC supplied with Windows: the key may be preinstalled in its firmware, included in the packaging, or printed on a Certificate of Authenticity. Setup may detect a firmware key automatically.
    • Microsoft online purchase: check the purchase confirmation email and Microsoft account order history.
    • Authorized retailer: check the retailer’s confirmation email, digital locker, box, or key card.
    • Free upgrade from Windows 7/8.1 or Store-purchased Pro upgrade: this normally uses a digital license rather than a separate key. ^4^

    If Windows came preinstalled and the motherboard is being replaced outside the manufacturer’s warranty repair process, the original OEM license might not reactivate. If neither a transferable digital license nor the original key is available, contact Microsoft Support or purchase a license through Settings → Update & Security → Activation → Go to Store. ^1^

    References

    1. [Windows 10](https://support.microsoft.com/windows/activation/reactivating-windows-after-a-hardware-change#if-you-don't-have-a-digital-license,-enter-your-product-key)
    2. Reinstall Windows with the installation media | Microsoft Support
    3. [Windows 10](https://support.microsoft.com/windows/activation/activate-windows#activate-after-reinstalling-windows-10)
    4. Find your Windows product key
    AI-generated content may be incorrect. Read our transparency notes for more information.

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