Windows 10: Lost Product Key & motherboard has been replaced

I lost my product key to a laptop that the motherboard has also been replaced.

where & how can i find my product key and how can i activate my windows 10?

I have all the digits of the key except the 5 digits.

Please help

:)

 

Lost of Product Key

I bought my Laptop in July 2015 with the Home and Student Microsoft Word. When I refreshed my computer I lost the Product key and I could not find the CD that contain the product key. What shall I do please suggest and help.

 

I lost my product key

We know nothing about your computer, or how you lost your product key.

More information is required to assist you correctly.

I suggest that you read this for suggestions on how to ask a question in help forums:

"Suggestions for asking a question on help forums"

http://support.microsoft.com/kb/555375/en-us

 

Troubleshoot activation errors in Windows 10 after a motherboard replacement or entering a Volume License key

Technical Level : Basic

Summary

We have a troubleshooter that can help with certain activation errors you might get:

• 
  If your PC’s manufacturer replaced your motherboard under warranty
  
  • 
    Activation Error 0x803F7001
    
• 
  If you entered a Volume License product key
  
  Note For these errors, you will need a valid (non-Volume License) product key for Windows 8, 8.1, or 10 to finish the activation.
  
  • 
    0x8007007B
    
  • 
    0xC004E016
    
  • 
    0x8007232B
    
  • 
    0xC004F074
    
  • 
    0xC004F038
    

Before trying the troubleshooter, make sure you are on the most current version of Windows 10. From Start, select
Settings, then choose System, and then press
About. You should see Version 1511 listed. If you don’t see it, then click
Settings, Update & Security, Windows Update and click
Check for updates.

Once you know you’re on version 1511, download and run the troubleshooter:
http://aka.ms/diag_cssemerg79558

If you had one of the Volume License key errors, you will be asked for a new key after the troubleshooter runs.

If you have trouble running the troubleshooter, please reply below.
If you have another Activation issue, please post in the Download, Install and Activation folder of the Windows 10 support forum.

Results in Windows - Microsoft Community

Details

Activation errors after motherboard replacement

Starting with Windows 8 and continuing with Windows 8.1 and Windows 10, most PC manufactures are injecting their Windows product key into the motherboard of the PC.
This allows the PC to activate automatically when you first boot up the PC and to re-activate if the PC is ever reset or needs a clean install.
The product key in the motherboard is edition-specific and will only activate that edition of Windows (Home, Pro, etc.).

When the motherboard is replaced under warranty, Windows will detect a hardware change and look for the new product key that was included in the replaced motherboard.
Sometimes the new product key is not retrieved by Windows, and you get
Activation Error 0x803F7001. The troubleshooter will ask Windows to re- try retrieving the product key from the new motherboard and activated it.

Correcting the mistake of entering a Global Volume License key

The troubleshooter also corrects a second, less common issue.
If you searched the web, you might have found and entered a Global Volume License (GVL) Key.
GVL Keys only work for PCs in an Enterprise environment where the administrator has setup this system of licensing.
If you mistakenly entered a GVL Key, you PC will no longer accept regular product keys, and will give the activation error 0x8007007B (or even 0xC004E016, 0x8007232B, 0xC004F074, 0xC004F038).
This troubleshooter will identify the GVL Key and replace it with a regular retail default key.
Your PC will not activate yet, but now will accept normal retail and OEM product keys.