Hey, about a month ago I transferred my data to a new SSD from one of my HDDs so my SSD was my boot drive. Last night I changed to a new motherboard, case, PSU, and video cad. When I tried to boot at first, nothing really happened, so I manually had to make my SSD (for some reason there were two versions of it, one that I am using now that has my OS and the other which wanted me to install Windows on it) my boot drive (btw I am using an 8.1 OEM). Now I got to Windows with all my files and stuff, but in the bottom right corner it said "Windows 8.1 Build 9600" so I tried to remove it with a command but eventually removed it with a watermark-remover. Now I am trying to change my lock screen background when I noticed it said "You have to activate Windows before you can personalize your PC." I went to "Activate Windows" and it said my product key is being used on another PC. My current product key is the one I've always had. Please I could really appreciate any help. I would be eternally indebted to you!!