Windows 10: Help With Getting Old Product key from dead PC

My old PC died, and I have a new PC now and need to activate windows.I un-linked my old PC from my account thinking it would transfer the license to my new PC but that didn't work.I don't have the email that has my product key because it was through my school email address which transitioned my old email to a new alumni server a couple years ago. Is there any way to get my windows activated or am I screwed and will need to re-purchase windows?Note: the original purchase for the product does show up in my order history in case that matters.Additional details: I originally purchased Windows 8.1

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Product key association disable on old pc

Hey,


I sold my old pc to a friend. He installed some missing parts (HDD, GPU and RAM). Then we installed Windows 10 Home 64-bit version from USB stick. I was surprised to see that windows was automatically activated after that. I did some digging and found out that it is using my product key, which i use now in my own new pc. My friend does not have his own product key, the idea was that he just uses the unactivated windows with limited features.


I uninstalled my Windows 10 product key via command prompt in friends computer (as i understand this is only local solution, if he reinstall windows or clicks the active button, it reactivates automatically with my product key) and now it says windows is not activated, but my product key is still shown with Produkey app in his pc. So far windows is still activated my own pc.


My questions:

1. Is this all i need to do?
2. How do i get rid of product key showing still with product key showing apps on my friend's computer?
3. Is there a way to get rid of association of my product key on that old pc that i sold to friend?

EDIT: I originally installed windows 10 via upgrade option from Windows 7, if that matters.

 

How do you get an old product key back from a completely dead computer?

Hello,

I own a MacBook Air now for art but I'm trying to make it so it could use "Bootcamp assistant" to switch back and forth from IOS to Windows 10 so I can play PC games. I had an old Windows 10 but it's completely dead/unusable now. I had a product key with
it but I'm not sure how to get it back. Or if it was possible to get a completely new one from somewhere. Or get the old one from some worker.

Is there a way to get that product key back or would I have to get a new one somehow?

 

Need some help. Old HDD. New laptop.

Yes, that would be a favorable solution if possible. But it requires what I said as a first step. Once he gets booted into the OS, then he can either use it as is or try to recover the product key. I'm not saying he couldn't do what you said, I was replying to another post that suggested simply copy/pasting documents from the old hard drive.