I've read threads similar, but not quite my scenario, so here I am asking. I have my own custom build, and I'm replacing my CPU, motherboard, ram, and heat sink, and keeping everything else. I had windows 8.1 installed to my SSD, and I'm not sure whether it was OEM but regardless I have no way of accessing the key(s) etc since someone built and installed the OS for me. If I buy another OEM license for windows 8.1 for my new motherboard, what should I do to install it without loosing "hidden" files on my SSD (I can find/move files I saved like games videos etc), but I'm not sure if I'd need any other files that could be in folders deeper inside that would be lost if the SSD could be wiped completely. Best case scenario I'd like to completely uninstall windows from the SSD so there wouldn't be conflicts/extra files (ocd) when I reinstall with the new board. I have a second HDD, and I know I should unplug it when I install windows again so it goes back on my SSD, then plug it in after everything is working properly.