Krigare Mario :
So I had bought my friend's motherboard off of him (Which is an ASRock Z97 Extreme6) so we could save some money. I got the motherboard and set it up with all of my other tech, including my OS. His PC had run the same version of windows I had (Windows 10 Pro) so I believed there would be no issues with the swap, but the "activate windows" message appears. How can I remove that message?
-If both keys were retail, just enter in your key (right click on windows icon and go to system, there's an option at the bottom).
-If your key was OEM and his was retail, one of you will need to buy a new license (probably you).
-If he had an OEM license on it and you had OEM, you need to get the key from your friend (remind him that his key is now useless for a new motherboard).
-If his was OEM and you have retail, you can either swap the retail key for his mobo and OEM key (plus the difference between the key and mobo "price"), or you can force him to buy a key with the cash you paid him (mostly same result, but now you keep your retail key, lose the OEM key)