I have accidentally removed a device

Question

I had some problems with my PC, so I reset my C: drive and replaced my motherboard, which may have had Windows pre-installed on it. Now, Windows sees my PC as a separate device altogether, and asks me to activate Windows. Signing into my Windows account and going through the troubleshoot option within Windows>security>activation does not fix the issue. In trying to get my account to recognize my computer as the same device, I deleted the original 'device' within my account settings.

Answer 1

You indicate the Windows licence was pre-installed on the PC originally, what is the source of the Windows licence, was that pre-installed by the PC manufacturer, or did you purchase a full retail Windows licence separately to the PC from Microsoft or from a 3rd party retailer and did a custom PC manufacturer install that licence for you.

Also, was the Windows licence originally Windows 7, 8, 10 or 11.

Answer 2

Removing the old device entry from the Microsoft account does not by itself deactivate Windows, but it does remove the easiest path for self‑service reactivation after a hardware or system change. After a reset, Windows can see the PC as new hardware, and if the digital license is not correctly linked or cannot be matched, activation and the Activation troubleshooter can fail.

For Windows 10/11, the supported options from here are:

1. Confirm the digital license is (or was) linked to the Microsoft account
   • On the current installation, go to Start > Settings > Update & Security (or System > Activation in Windows 11) > Activation.
   • Check the activation status text:
     • “Windows is activated with a digital license linked to your Microsoft account” means the account link is in place and the troubleshooter should work after a significant hardware change.
     • “Windows is activated with a digital license” (without mentioning the Microsoft account) means the license was not linked and cannot be re‑matched via the account.
   • If the account is not linked and the device is activated, follow the Add an account steps in the same page to link it for future changes. This will not fix the current unactivated state but is important once activation is restored.
2. Use the Activation troubleshooter (only when Windows shows as not activated)
   • Sign in with an administrator account.
   • Go to Settings > Update & Security > Activation and select Troubleshoot (this option appears only when Windows is not activated).
   • When prompted, choose I changed hardware on this device recently, then sign in with the Microsoft account that previously held the digital license.
   • If a list of devices appears, select the checkbox for This is the device I’m using right now and then Activate.
   • If the device list is empty or the correct device is missing (for example, because it was removed from the account), the troubleshooter cannot complete the transfer.
3. When the troubleshooter cannot find a matching device
   • If the original device entry was deleted from the Microsoft account and the troubleshooter no longer shows it, there is no self‑service way to restore that mapping.
   • In similar cases where:
     • the digital license is Retail (purchased from Microsoft), and
     • hardware has changed or the system was reinstalled, and
     • the Activation troubleshooter cannot locate a transferable device, community guidance is to contact Microsoft Support so an agent can locate the license on the account and manually reactivate or re‑bind it to the current hardware.
   • Phone activation has also been used successfully in cases where online reactivation fails.
4. If the license was from a free upgrade or non‑transferable source
   • Some older free‑upgrade digital licenses (for example, from Windows 7/8 to Windows 10) are no longer transferable to new devices. In those cases, even if the device was previously moved once, current policy may prevent further transfers, and the Activation troubleshooter will not succeed.
   • If the license falls into that category, the only supported resolution is to obtain a new Windows license or product key.
5. If the PC was pre‑owned or pre‑installed
   • If the PC was bought with Windows pre‑installed and the product key was used on more devices than allowed, activation can fail after a reset or hardware change. In that scenario, a new product key or copy of Windows is required.

Given that the original device entry has been removed and the troubleshooter does not resolve activation, the next supported step is to:

• Verify whether the license is Retail and visible in the Microsoft account purchase history.
• Use the Activation page to attempt Troubleshoot → I changed hardware on this device recently one more time while signed in with the correct Microsoft account.
• If the device still does not appear, contact Microsoft Support or use phone activation so the license can be manually reassigned, if eligible.

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References:

• Reactivating Windows after a hardware change
• Why can't I activate Windows?
• Using the Windows Activation troubleshooter
• Unable to activate Windows 11 Pro digital license after device change - Microsoft Q&A
• I cannot find my product key even though I purchased Windows - Microsoft Q&A
• Windows reactivation fails - Microsoft Q&A
• Unable to activate windows after hardware update - Microsoft Q&A
• Reactivate Windows 11 - Microsoft Q&A