Windows 10: I switched out my motherboard and lost my old product key

I switched out my motherboard and lost my old product key. I can't find it on my account because like the idiot I am. Instead of calling Microsoft first, I tried to just find some random key that works online. So I put it in but I accidentally am now connected to some random organization. All I want is to get my old product key back so I can call Microsoft and fix my ****.

:)

 

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

 

Switched out motherboard

I have recently switched out my motherboard and am having difficulty finding where the Windows product key is located. My computer was activated before the motherboard switch but I am unsure what email I used as most of my old email accounts I no longer
have access to (deleted)

 

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.