PC 64bit / Windows 8.1 Problem My validated Windows 8.1 Pro Preview hard drive failed. New drive, reinstalled Windows 8.1 Pro Preview but it wont validate. I have about 8 keycodes from various installations, but this one won't validate using any of them. I'd like to just jump to Windows 10, but don't have a clue to resolve the keycode issue? Help Appreciated - Bob PS Windows 10 running on my main 64 bit PC. Flawless, quick installation over 8.1, runs great!