[Verification] Is Windows 10 ESU still valid after resetting your PC? Explains whether re-registration of the license is necessary

Even after support for Windows 10 ends, many people continue to use their beloved PCs safely by subscribing to the paid Extended Security Updates (ESU). However, when such a PC starts to become unstable, the first thing that comes to mind is the option to "reset this PC (restore this PC to its original state)."

"But if I reset my PC, won't my paid ESU subscription rights be lost?"

Are you hesitant to perform PC maintenance due to concerns like these? In this article, we will provide a clear answer to that question by actually initializing a PC that has registered ESU and thoroughly testing what happens afterwards.

About the verification environment for this article

All testing in this article was performed on a standard personal computer (standalone environment) that was not joined to a specific domain. Please note that behavior may differ on computers used in companies, etc.

*ESU for individuals is free if certain conditions are met. For details, please see the following page.

• [October 2025] Windows 10 support ends! Should you continue using it? Or upgrade to Windows 11? Explaining your best options

Conclusion: No need to re-register for ESU! It will be automatically re-recognized by Windows Update.

First, let me tell you the most important conclusion.Even if you reset your PC using the "Reset this PC" feature, your ESU license will not be lost and you will not need to re-register.I understood that.

Immediately after initialization, the ESU will not be applied temporarily.Run Windows Update to apply the latest updatesThis will reactivate your PC's ESU entitlement.

Why doesn't the ESU license expire?

*However, when you register for Windows 10 ESU for the first time, you will need to sign in with your Microsoft account to manage your license.

So why is it that once you register, the license is restored even if you reset the PC with a local account?

This is because the ESU license is stored on your PC's motherboard, rather than in your Microsoft account or as a file on your PC.Hardware-specific ID This is probably because it is linked to the user and recorded on Microsoft's authentication server.

To put it simply, it is a device that is linked (registered) to a Microsoft account that has been registered for Windows 10 ESU.

Even if you reset your PC, the hardware itself remains unchanged. Therefore, when the PC connects to the Internet after resetting and communicates with Microsoft servers via Windows Update, it will automatically recognize that the PC is now eligible for ESU.

[Testing on an actual device] How does the two initialization patterns affect the results?

Let's take a look at the detailed process and results of this test. We checked the behavior of both the "Keep personal files" and "Delete everything" options.

Pattern 1: Initializing with "Keep personal files"

First, there is a way to clean only the Windows system part while leaving the user's documents, photos, etc. intact.

1. Execute initialization: I went to "Settings" > "Update & Security" > "Recovery" and selected "Keep my files" under "Reset this PC".
2. State immediately after initialization: Immediately after initialization is complete and the desktop is displayed, the ESU license is temporarily disabled.
3. Solution: Run Windows Update: Then I ran Windows Update, installed all available updates and restarted my PC.
4. Final resultAfter applying the latest updates, ESU will be re-enabled and you will be able to receive security updates as normal.

If you are enrolled in ESU, typically Windows Update screenAt the bottom of the screen, it says "Your PC is enrolled to receive Extended Security Updates." However, depending on your environment, it may be displayed in the upper right corner.

Pattern 2: If you "delete everything" and initialize

Next, we'll show you how to restore your PC to a completely clean, factory-fresh state.

1. Execute initialization: Similarly, I performed "Reset this PC", but this time I selected "Remove everything".
2. State immediately after initialization: The initial setting screen will appear, and this time Don't sign in with a Microsoft account; create a local accountI booted into Windows and the ESU license was still released.
3. Windows Updateの実行: While signed in with a local account, I ran Windows Update and applied all available updates.
4. Final result: Surprisingly,Even though I've never signed in with my Microsoft accountOnce Windows Update is complete, ESU willReverts to valid stateThis strongly suggests that ESU entitlement is tied to the PC hardware itself, not to a Microsoft account.

[Advanced] How to check if ESU is enabled in the registry

Once a Windows Update is complete and ESU is enabled, a specific key will be added to the registry as evidence.

If you're interested, check the following key in Registry Editor:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SoftwareProtectionPlatform\ESU

If the following four REG_DWORD values ​​exist within the key, it means that ESU has been successfully enabled on your PC.

• Win10CommercialAzureESUEligible
• Win10CommercialKeybasedESUEligible
• win10ConsumerESUStatus
• Win10ConsumerESUAY

[Important] The registry key is just a "proof of registration"

By the way, even if you copy this registry key and paste it on another PC that is not enrolled in ESU, it will not enable ESU.

Your ESU license is linked to your PC's hardware information on Microsoft's activation servers, and the registry key is simply a record of the activation process.

Summary

This testing revealed some very important facts about Windows 10 ESU:

• Even if you reset your PC, you will not lose your ESU rights.
• After initialization, the registration will be temporarily deactivated, but it will be restored automatically once Windows Update is completed.
• Your ESU license is most likely tied to your PC hardware and not your Microsoft account.

Even if you're enrolled in ESU and are continuing to use Windows 10, you no longer need to fear resetting your PC if it becomes unstable. Follow the steps explained in this article to perform PC maintenance with confidence.

• How to reset your PC and back up drivers in Windows 11
• [Verification] Solution to the issue where adding a new user to a Windows 10 ESU-enrolled PC displays "Service Ended"

[Added 2025/10/24] Verification: When the hardware configuration is changed when reinstalling the OS

Normally, even if you initialize your PC (reinstall the OS), if the hardware configuration is the same, the Windows 10 digital license will be automatically activated and the ESU license linked to your Microsoft account will also be automatically recognized.

But,When you reinstall the OS and make minor changes to your hardware configurationA reader of our site has shared with us a very valuable case study on exactly this issue.

Case reports from readers

• environment: Windows 10 on a Virtual Machine (ESXi 6.5)
• Original condition: Free ESU license registered
• Actions taken:
  1. Relocate the virtual disk to another one
  2. Change the virtual machine memory from 4GB to 6GB
  3. After making the above changes, perform a clean reinstall of Windows 10.
  4. After a clean install, Windows 10 was automatically activated with a digital license.
  5. Add the Microsoft account associated with ESU to Windows
• result: From reinstalling the OS Four days have passedHowever, the ESU license status remained "unregistered."

Discussion: Why does ESU remain unregistered?

This case suggests that if changes are made to the hardware configuration (even virtual ones) when reinstalling the OS, automatic activation of the ESU license may not proceed smoothly. The main possible causes are as follows:

1. Windows Update is out of date: Immediately after a clean installation, the system components required for ESU certification may be out of date.
2. Issues with linking your Microsoft account to your device: A hardware configuration change may have caused your PC to be recognized as a "new device" in your Microsoft account, which may have reset the association with your ESU license.
3. Delays in the activation process: The ESU license activation process is experiencing longer than normal delays for some reason.

Workaround: Force refresh of ESU license status

If you encounter this "ESU not registered after OS reinstall" issue, the most likely solution is:Manually trigger the ESU license activation process and re-register your current device to your Microsoft accountIt is that.

Please try the steps below.

Step 1: Perform certain system tasks

First, run a specific system task to force an update of your ESU license status, as outlined in another article on this site.

▼Please perform the tasks introduced in this article.
[Verification] Solution to the issue where adding a new user to a Windows 10 ESU-enrolled PC displays "Service Ended"

Step 2: Re-register your device on the Windows Update screen

After performing the above task, the ESU license status will be refreshed and you will see a change in the Windows Update screen.

1.Windows Update screenOpen.

2. You should see a link on your screen (either at the bottom or to the right) that says "Register Now." Click on it.

3. On the screen that appears, [Enable Extended Security Updates], click the "Next" button.

4. [Add this device so it can receive Extended Security Updates]

The message "Your Microsoft account [email address] is already enrolled in Windows 10 Extended Security Updates. To receive security updates on this device, select Add a device." Click the "Add a device" button.

(This step is important as it links your current PC (the PC after OS reinstallation) to your ESU license.)

5. When the message "This device will now receive Extended Security Updates until October 13, 2026" appears, click the "Finish" button.

Your ESU license should now be linked to your current PC, and your ESU should now be in a "Registered" state.

Your PC is enrolled to get Extended Security Updates.

This time,Nanashi-samaThank you very much for providing us with such valuable information.