Activation of Windows

Question

Activation of Windows

Arinda Kevin 0

My current Windows edition is Windows 10. My motherboard was replaced, and it appears my PC doesn't recognize this new motherboard, and my previous license altogether. I desperately need to activate my Windows but i don't know where to start from

Neil D 34,200 Reputation points Volunteer Moderator

2026-09-10T08:06:50.2833333+00:00
It depends on the type of licence you had previously.

Was it part of the free upgrade from Windows 7/8.

Did you buy the licence separate from the device originally.

Was the licence provided by the system builder or manufacturer.

Open a Command prompt and enter slmgr /dlv [press return] post a screenshot of the result.

2 answers

Your answer

Neil D 34,200 Reputation points Volunteer Moderator

2026-09-10T08:06:50.2833333+00:00

It depends on the type of licence you had previously.

Was it part of the free upgrade from Windows 7/8.

Did you buy the licence separate from the device originally.

Was the licence provided by the system builder or manufacturer.

Open a Command prompt and enter slmgr /dlv [press return] post a screenshot of the result.

Answer 1

DaveM121 928.6K Independent Advisor

1

Where did you get your Windows licence was that pre-installed on the PC or did you purchase a full retail Windows 10 licence from Microsoft or from a 3rd party retailer, and if so, do you have the product key?

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

2

Download the free ShowKeyPlus app from the Microsoft Store.

Please provide a screenshot of that app window and please hide any product key in the screenshot.

0 comments

Answer 2

A motherboard replacement is treated as a significant hardware change, so Windows 10 may no longer find the license that was previously associated with the old hardware.

Start here:

Open Start > Settings > Update & Security > Activation.
Check the activation message and current edition.
If Troubleshoot is available, run it. The troubleshooter is available only if Windows 10 isn’t activated.

If Windows was activated before and linked to a Microsoft account:

In Activation, select Troubleshoot.
If shown, use the option to reactivate after a hardware change.
Sign in with the same Microsoft account that was associated with the digital license before the motherboard was replaced.

If a product key is available:

Go to Start > Settings > Update & Security > Activation.
Select Change product key.
Enter the 25-character product key and follow the prompts.

Important checks:

The installed Windows edition must match the license. For example, a Windows 10 Home license will not activate Windows 10 Pro.
If this is the first time Windows 10 is being activated on this motherboard and there is no valid product key or digital license, a new license may be required.
If the PC originally came with Windows preinstalled and the motherboard was replaced by the original hardware manufacturer, it should reactivate automatically. If it does not, check for a COA card with a 25-character key.

If error 0x803F7001 appears, it means Windows could not find a valid license. Common causes after a motherboard replacement are:

the hardware changed and the old license no longer matches
the wrong Windows edition is installed
there is no valid product key or digital license available for the current hardware

If the troubleshooter does not resolve activation after the hardware change, contact customer support.