Lost windows key

[J0E24]

Hello, I recently got a ssd, and want to load my OS onto that from my HD. The thing I am running to, is that I have lost my physical copy of the windows key that came with the Cd when I purchased it. I purchased windows 8.1, then was notified of the free upgrade to Windows 10.

My question is, is there a way to find my windows 8.1 key on my system?

All of this to install the OS onto the ssd.

Thanks

 

[1N07]

Activating Windows 10 after hardware change

Or use this to get the actual key