A Windows 10 product key cannot be issued through Q&A; activate with the digital license already attached to your PC or enter the legitimate key supplied with your purchase.
Activate Windows 10
- Connect the computer to the internet.
- Open Start → Settings → Update & Security → Activation.
- Check the activation status.
- If you previously activated Windows 10 on this computer with a Microsoft account, sign in using that same account. A digital license is associated with the device hardware and can be linked to the Microsoft account, so no product key needs to be located or entered.^1^
- If you have a 25-character key, select Change product key, enter it, and complete the prompts.^2^
Where to find a legitimate key
Depending on how Windows was obtained, look in:
- PC supplied with Windows 10: device packaging or the Certificate of Authenticity attached to the PC.
- Boxed retail copy: label inside the Windows 10 box.
- Digital copy from a retailer: purchase-confirmation email or the retailer’s digital locker.
- Microsoft Store purchase: confirmation email or Microsoft account associated with the purchase.
- Volume Licensing or MSDN: the relevant program portal.^1^
Do not use keys published online; they may be stolen, blocked, or licensed for another device or edition.
If there is no license or key
From Settings → Update & Security → Activation, select Go to Store to check the available purchasing options. Microsoft documents this as the route for purchasing a digital license when the computer has neither a product key nor a digital license.^2^
If activation fails, record the exact error code shown on the Activation page. That code is needed to identify whether the problem concerns the license, installed Windows edition, or a hardware change.
References
- [Windows 10](https://support.microsoft.com/windows/activation/activate-windows#in-windows-10,-what-windows-activation-method-do-i-use,-a-digital-license-or-a-product-key)
- [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)