Windows 8.1 Key Showing as Invalid

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I recently built my first gaming PC but did not purchase a Windows software key because I was planning on deactivating the Windows 8.1 key on my rarely used laptop. (My laptop came pre-installed with Windows 8.1 and was then upgraded to Windows 10 using the free upgrade). I looked up ways to un-install the Windows key and most of the time found a code to use in command prompt (slmgr /dlv), I tried this method and got a notification to say the key had been successfully un-installed. I then tried to use the old 8.1 key on my new PC which has Windows 10 installed and it showed up as invalid. I contacted Microsoft and they told me I would have to downgrade my computer to 8.1, use the key, then upgrade to Windows 10 again but before my chat ended with the assistant from Microsoft I was informed that my key was still invalid even for Windows 8.1 and that I would have to contact the manufacturer of my laptop (Lenovo) to resolve this problem, so I did. All I got back was an email telling me to use the one key recovery on my laptop but don't understand how this will help since the key is showing as invalid, I have already un-installed it and I need to be able to use it on my new computer rather than my old laptop.

So basically, is there anyway I can get the old Windows 8.1 key to work on my new PC?

I would rather not turn to useless support team members from Microsoft and Lenovo as they haven't really helped much and don't think they actually understand the problem so I am here hoping someone can give me a solution to this problem.

All help is greatly appreciated, thank you.
 
Solution
No, you never had a valid key so you need to buy a new one. You CANNOT deactivate keys in Windows, and OEM keys (like your laptop) ARE NOT TRANSFERABLE!
I'm not trying to pirate my Windows, I thought it was possible to take Windows completely off my laptop to use in my computer, not have it on both.

 


You ARE PIRATING IT if you do that, because your license clearly states that it cannot be transferred to a new computer. You do not have a license you can use, you MUST buy a new one.