I was using microsoft windows 10 home edition and lost the product key during reinstallation

kumar sachin 0 Reputation points
2026-10-15T13:01:14.8066667+00:00

Hi,

I have lost the product key which is digitally signed for windows 10 home edition. During reinstallation it asks for product key, how can I retrieve the key or reinstall the windows 10?

Thanks

Windows for home | Windows 10 | Licensing and activation
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  1. DaveM121 945.9K Reputation points Independent Advisor
    2026-10-15T13:37:07.5233333+00:00

    1

    During the reinstallation process, there should be a link at the bottom of the window to skip the step to insert a product key, so you can complete the installation.

    2

    Where did you get your Windows licence was that pre-installed on the PC or did you purchase a full retail Windows licence from Microsoft or from a 3rd party retailer?

    Or is your Windows licence based on a free upgrade from a previous Windows 7 or 8 licence?

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  2. AI answer

    2026-10-15T13:01:49.18+00:00

    If Windows 10 Home was previously activated on that same device, a product key may not be needed to reinstall it.

    1. Before reinstalling, check activation status if the old installation is still accessible:
      • Start > Settings > Update & Security > Activation
      • If it shows Windows is activated with a digital license, the device can be reinstalled without entering a product key.
    2. Reinstall the same edition: Windows 10 Home.
      • During setup, if prompted for a key, select I don't have a product key.
      • After installation completes, connect to the internet. Windows should activate automatically online if the device already has a digital license.
    3. If the device originally came with Windows preinstalled, the product key may be:
      • preinstalled on the PC,
      • included with the packaging, or
      • attached on a Certificate of Authenticity (COA).
    4. If Windows was purchased digitally:
      • From an authorized retailer: check the confirmation email or the retailer’s digital locker.
      • From the Microsoft website or Microsoft online store: check the confirmation email or Microsoft account Order history.
    5. If Windows 10 Home was activated using a Microsoft account-linked digital license, activation works by signing in with the linked Microsoft account and connecting the PC to the internet.
    6. If there was a major hardware change such as a motherboard replacement, reactivation may be required. The digital license or product key will reactivate only if the edition remains the same.
    AI-generated content may be incorrect. Read our transparency notes for more information.

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