Forgive me if this has been covered a thousand times! I could not find a specific answer although may have been looking in the wrong places..! 1) New self built pc with ssd for OS - specs all fine for Win 8.1 2) NO OEM OS ever installed previously so no key in BIOS 3) Perfectly legal purchase of full Win 8.1 Pro DVD OEM with COA sticker etc I am a stranger to fresh install of this version of windows so excuse my naivety! It will not activate - Key Blocked Now, from seemingly endless searches with a raft of information and yet nothing to explain exactly how to install. Apart from, that is, much tl;dr on microsoft.com oem partner blah blah regarding pre-install using ADK etc. Do I really need to do all that just to install an os with no support etc? I'm tempted to just whack ubuntu on it and have done with it - write off the £103 I thought I saw generic OEM installation keys somewhere on MS site but can now not find them... Any guidance would be greatly appreciated! One last point for now - the mobo is an MSI 970A-G43 AMD 970 ATX Motherboard (PCI-E, Socket AM3+) UEFI BIOS Do I need to enable the "Windows 8" features in bios to allow burning in of the key?