steven37 :
The thing is I am wanting to sell this computer soon but I can't find the OS disk anywhere to clean and reinstall it on the drive and I didn't really want to sell a computer with all my data on it and since it's a ssd I was going to see if I can upgrade my mothers old computer while keeping the OS on here.
"The thing is..."
...it does not matter what the reason is!
If you just want to sell it with no OS, just wipe the drive and sell it. DBAN, or any Linux Live CD.
And you can't install that Windows OS on the for sale system, AND use that same license on the SSD in a different system.
Are you selling the system with or without the OS? It makes a difference.
But moving the SSD, with installed OS, to a different PC is a non-starter. It almost certainly will not work.