Activation Problem After Upgrade from Windows 10 Pro 32-bit to 64-bit. Windows 10 IT Pro > Windows 10 Installation, Setup, and Deployment. For more info about how to use a Windows 7, Windows 8, or Windows 8.1 product key to activate Windows 10 (Version 1511 or higher).

  1. Windows 10 Home Serial Key
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Windows 10 requires activation to verify you're running a genuine copy; a unique product key is used to ensure the a single licensed copy of Windows isn't being used on more than are allowed.

  1. Since upgrading to windows 10 I am asked to activate product.Activation key is not accepted. We had the same problem when upgrading to windows 8.1.
  2. If you bought a new PC running Windows, the product key will be pre–installed on your PC and the key will be included in the firmware in the case of Windows 8 or 10 - or as an OEM marker, in the case of previous versions.
  3. When you upgrade to Windows 10 from Windows 8 you can encounter glitches with product activation. Here’s an easy way to find the product key after upgrading.
  4. Nov 16, 2018  For more info, see Activation in Windows 10 or contact Microsoft Support. Free upgrade to Windows 10. If you upgraded to Windows 10 for free from Windows 7 or Windows 8.1, you should have a digital license instead of a product key. For more info about digital licenses in Windows 10, see Activation in Windows 10 or contact Microsoft Support.

Occasionally, you may have to change the product key. If you're getting Windows 10 for the first time and a product key wasn't provided during the installation, or a generic key was used to upgrade, you'll need a new valid product key to activate the operating system.

Windows 10 Home Serial Key

In this Windows 10 guide, you'll learn five ways to bring up the Windows activation tool to change the product key on your computer.

How to change Windows 10's product key using Settings

  1. Open Settings.
  2. Click on Update & security.
  3. Click on Activation.

  4. Click the Change product key link.

  5. Type the 25-digit product key for the version of Windows 10 you want.

  6. Click Next to complete the process.

If the activation process completes successfully, you'll get the 'Windows is activated' message.

How to change Windows 10's product key using Control Panel

  1. Use the Windows key + X keyboard shortcut to open the Power User menu and select System.

  2. Click the Change product key link under the Windows activation section.

  3. Type the 25-digit product key for the version of Windows 10 you want.

  4. Click Next to complete the process.

Similar to the Settings app, if the activation process completes successfully, you'll get the 'Windows is activated' message.

How to change Windows 10's product key using Command Prompt

  1. Open the Start menu.
  2. Search for Command Prompt.
  3. Right-click the result and select Run as administrator.

  4. Type the following command using your 25-digit product key and press Enter:

    slmgr.vbs /ipk <enter your 25-digit product key here>

If you typed the product key correctly and the process completes successfully, you'll see a dialog box reading 'Installed product key YOURP-RODUC-TKEYX-XXXXX-XXXXX successfully.'

How to change Windows 10's product key using SLUI 3

  1. Use the Windows key + R keyboard shortcut to open the Run command.
  2. Type slui.exe 3 and click OK to open the Windows activation client.

  3. Type the 25-digit product key for the version of Windows 10 you want.

  4. Click Next to complete the task.

If the activation process completes successfully, you'll get the 'Windows is activated' message.

How to change Windows 10's product key using CHANGEPK

  1. Use the Windows key + R keyboard shortcut to open the Run command.
  2. Type changepk.exe and click OK to open the Windows activation client.

  3. Enter the 25-digit product key for the version of Windows 10 you want.

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  4. Click Next to complete the task.

If the activation process completes successfully, you'll get the 'Windows is activated' message.

Alternatively, you can use change the product key using changepk.exe using the Command Prompt as well. Here's how:

  1. Open the Start menu.
  2. Search for Command Prompt.
  3. Right-click the result and select Run as administrator.

  4. Type the following command using your 25-digit product key and press Enter:

    changepk.exe /ProductKey <enter your 25-digit product key here>

Wrapping things up

While for the most part, you'll be using the Settings app to change the product key on Windows 10, if the option isn't available or if you're looking to create a script to change the product key on your computer, it's good to have different alternatives.

If you're trying to upgrade the operating system by purchasing a new license from the Windows Store, everything regarding the product key will be handled automatically for you.

Also, remember that you must be signed in with an administrator account to change your system's product key, and you'll need an internet connection to complete the activation.

In the case, you recently made significant hardware changes to your PC, and Windows 10 won't activate, you can use the Activation Troubleshooter to re-activate your copy of Windows 10.

Although this guide is specific to Windows 10, the Control Panel, slui.exe, and slmgr.vbs methods that we're showing you here will work to change the product key on Windows 8.1 or Windows 7.

More Windows 10 resources

For more help articles, coverage, and answers on Windows 10, you can visit the following resources:

If we all upgrade to windows 10, what happens to our windows 7/8/8.1 Key after the update to windows 10?

In the case of Windows 10 Preview, it is pre-release software which will expire. In the case of Windows 10 final version:

15. UPGRADES. To use upgrade software, you must first be licensed for the software that is eligible for the upgrade. Upon upgrade, this agreement takes the place of the agreement for the software you upgraded from. After you upgrade, you may no longer use the software you upgraded from.

Can we use our previous key to reinstall windows 7 or 8 or 8.1 after it was use as an upgrade of windows 10?

Yes, or use the rollback function:

Will we have issue with activation of our window 7/8/8.1 key after the upgrade if we decide to go back to our old windows?

No use Internet Activation or Phone Activation if you encounter any problems.

Windows 7:

How to activate Windows 7 manually (activate by phone)
1) Click Start, and in the Search box type: slui.exe 4
2) Next press the 'ENTER' key
3) Select your 'Country' from the list.
4) Choose the 'Phone Activation' option.
5) Stay on the phone (do not select/press any options) and wait for a person to help you with activation.
6) Explain your problem clearly to the support person.
http://support.microsoft.com/kb/950929/en-us

Windows 8:

. Press Windows key + X then clickRun, then type: slui.exe 4

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2. Next press the 'ENTER' key

3. Select your 'Country' from the list.

4. Choose the 'Phone Activation' option.

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5. Stay on the phone (do not select/press any options) and wait for a person to help you with activation.

6. Explain your problem clearly to the support person.

Additional resources: