cant activate windows due to missing product key

Question

cant activate windows due to missing product key

Jacob Allen 0

ive updated to windows 11 with the free download but it keeps asking for a product key but i dont have one to put in so it wont let me activate windows, what do i do?

EmilyS726 279.7K Reputation points Independent Advisor

2026-10-24T04:16:09.87+00:00

Hello,

How did you obtain your license initially?

Did it come with the device preinstalled, or did you purchase it?

If you purchased it, did you purchase from Microsoft, or from third party?

Is it originally a Win7/8 key?

Just to make sure, is motherboard changed?
Jacob Allen 0 Reputation points

2026-10-24T09:52:47.8766667+00:00

so i previously had windows 10 and upgraded to windows 11 which was activated and working fine and then all of a sudden i went to boot my pc one day and it just wouldnt boot past the diagnosing you pc issue screen. it was stuck in a loop so i had to then go and download windows 11 onto a usb and then boot the first time off of that to then get my pc to work again but now i cant activate windows or find the product key anywhere. i just assumed it would be the same one as before but its not
EmilyS726 279.7K Reputation points Independent Advisor

2026-10-24T13:51:45.69+00:00

I see. I still need the other questions answered though.

How did you obtain your license initially?

Did it come with the device preinstalled, or did you purchase it?

If you purchased it, did you purchase from Microsoft, or from third party?

Also is this a custom build?

2 answers

Your answer

EmilyS726 279.7K Reputation points Independent Advisor

2026-10-24T04:16:09.87+00:00

Hello,

How did you obtain your license initially?

Did it come with the device preinstalled, or did you purchase it?

If you purchased it, did you purchase from Microsoft, or from third party?

Is it originally a Win7/8 key?

Just to make sure, is motherboard changed?
Jacob Allen 0 Reputation points

2026-10-24T09:52:47.8766667+00:00

so i previously had windows 10 and upgraded to windows 11 which was activated and working fine and then all of a sudden i went to boot my pc one day and it just wouldnt boot past the diagnosing you pc issue screen. it was stuck in a loop so i had to then go and download windows 11 onto a usb and then boot the first time off of that to then get my pc to work again but now i cant activate windows or find the product key anywhere. i just assumed it would be the same one as before but its not
EmilyS726 279.7K Reputation points Independent Advisor

2026-10-24T13:51:45.69+00:00

I see. I still need the other questions answered though.

How did you obtain your license initially?

Did it come with the device preinstalled, or did you purchase it?

If you purchased it, did you purchase from Microsoft, or from third party?

Also is this a custom build?

Answer 1

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Answer 2

A free upgrade to Windows 11 normally activates with your PC’s existing digital license, so you should run Activation Troubleshooter rather than enter a product key.^1^

Activate the digital license

Connect the PC to the internet.
Install current updates at Start > Settings > Windows Update > Check for updates, then restart. Current Windows 11 versions include activation and troubleshooting improvements.^2^
Sign in using the Microsoft account previously associated with this PC’s Windows license.
Open Start > Settings > System > Activation.
Select Troubleshoot. This option only appears while Windows is not activated and requires an administrator account.^3^
If offered, select Activate Windows, followed by Activate.

If the troubleshooter reports a different Windows edition

The installed edition must match the digital license:

A Windows 11 Pro license with Home installed: select Upgrade to Windows 11 Pro in the troubleshooter.
A Windows 11 Home license with Pro installed: Windows 11 Home must be installed instead. Back up your files first because a clean installation can erase them. During setup, select I don’t have a product key; the matching edition should activate automatically afterward.^3^

Check the currently installed edition under Settings > System > Activation.

If hardware was changed

If the motherboard or other significant hardware was replaced:

Sign in with the Microsoft account linked to the previous digital license.
Open Settings > System > Activation > Troubleshoot.
Select the link to reactivate after a hardware change, if displayed, and choose this device.

A digital license is associated with the device hardware, so a motherboard replacement can prevent Windows from finding the previous license.^2^

If no digital license is found

If Windows originally came with the computer, check its packaging or Certificate of Authenticity. For a refurbished computer, the refurbisher is responsible for supplying the key. Contact the PC manufacturer or refurbisher if the original license was never supplied.^4^
If Windows was purchased separately, check the retailer’s confirmation email or digital locker. Purchases from Microsoft can be checked in the Microsoft account’s order history.^4^
If this PC was previously activated with an eligible license but troubleshooting still fails, contact Microsoft customer support and provide the activation error code shown under Settings > System > Activation, plus proof of purchase if available.^2^
If the PC never had a valid Windows license, select Settings > System > Activation > Go to Store to purchase a digital license.^1^

Do not buy a cheap key from an unknown marketplace; without either a valid digital license or a genuine product key, Windows cannot be activated.

References