Hi, Let's say I buy a laptop with Windows 10 OEM pre-installed, is it possible for me to skip installation (as I really don't want Windows 10) and clean install Windows 8.1 OEM instead? (Let's say I got OEM Windows 8.1 from a previous laptop) and, will this other OEM Windows 8.1 key work, even if it's from another laptop ? (I know they are embedded bios keys) Thanks in advance