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#11
Ditto, to the "Windows 10 will not write any product key to your BIOS nor will it read Windows 7/8/8.1 keys from bios." Have a look at this, Microsoft quietly rewrites its activation rules for Windows 10
Also, for future reference, you don't have to install 8.0 and upgrade to 8.1 anymore. This install media , http://windows.microsoft.com/en-us/w...-refresh-media will let you install and activate with a Windows 8.0 key, even OEM embedded keys. Accepts Windows 8.1 keys too.