So I just built a pc. I initially put the Windows disk I and loaded it up l. I entered the key and it said it was wrong. After looking for solutions, i tried one which said to power of the computer and I was still on the screen with the activation key. I also reset my modem. After that I tried to boot Windows up again but all it says is reboot and select proper boot device or insert boot media in selected boot device and press a key. I only have 1 hdd