Windows 10: Windows 7 Product Key cannot be activated after re-installation

My MacBook Pro was down and I replaced the hard disk. I completed the re-installation of the Windows 7 Home Premium OEM version and the Bootcamp, only the Windows system was installed. Every thing is fine. However, I cannot activate the Windows using the Product Key. It prompts an error code "0x80072F8F". I want to upgrade Windows 7 to Windows 10 using the execution file, "Windows 10 Upgrade 9252", downloaded from Microsoft website. It does not open successfully. A message "\Windows 10 Upgrade 9252.exe is not a valid Win 32 application" was prompted.

:)

 

Installing Windows 10 using Windows 7 key

Nope, you need to install Windows 10 first and make sure the Windows 7 key is transferred to your Windows account after you've installed Windows 10 (not quite sure how that works). I missed the last step and I could not activate Windows 10 after a re-install... Microsoft seem to have done everything they can to make it a PITA. Also, it's technically too late to do this now anyhow, as the upgrade offer has expired. But KMSPico works quite well...

As for getting rid of Windows, delete the Windows folder.

 

Activate windows 10 after re-installing (I have lost my product key)

I own a Lenovo T430 laptop. In 2017, I installed Windows 10 using my original Windows 7 product key. Unfortunately, I cannot find that product key anymore. I need to re-install windows 10. Will it be automatically activated after the installation, if I skip the step of asking the product key during the installation?

In my opinion, I believe that my laptop will have a digital entitlement stored on the Microsoft Activation Servers and this will not be a problem. Is that true?

If not, please suggest me a solution or a workaround.

 

Window 10 installation and activation using Windows 7 Product key

Hello Sourabh,

Thank you for contacting Microsoft Community.

Starting with the November update, Windows 10 (Version 1511) can be activated using some Windows 7,
Windows 8, and Windows 8.1 product keys. During the free upgrade or installation, you can use a valid Windows 7,
Windows 8, or Windows 8.1 product key to activate
Windows 10 (Version 1511 or higher). The following types of product keys are supported:

• 
  Product keys included in the packaging or the Certificate of Authenticity (COA) attached to your PC that came installed with Windows.
  
• 
  Product keys included in the confirmation email you received after buying Windows from an online retailer.
  
• 
  Product keys included in the box the Windows DVD came in.
  
• 
  Product keys you bought using Windows Anytime Upgrade or Get Genuine Windows.
  
• 
  If you bought a Windows 8.1 Pro Pack product key, you can use it to activate
  Windows 10 Pro.
  

After Windows 10 is activated, a digital entitlement will be given to your device based on the product key you entered. This means that you’ll no longer need to enter a product key to activate
Windows 10 on this device.

On some devices that came pre-installed with Windows 8 or Windows 8.1, the product key is provisioned in the device firmware. On these devices the product key will be verified during setup, and then the appropriate edition of
Windows 10 will be installed.

Note:

• 
  Some Windows 7, Windows 8, and Windows 8.1product keys can't be used to activate
  Windows 10, such as product keys for volume licensing, including Generic Volume Licensing Keys (GVLK) and Multiple Activation Keys (MAK), and Windows 7 Enterprise,
  Windows 8 Enterprise, and Windows 8.1 Enterprise.
  

Keep us posted if you require further assistance.