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#21
AFAIK, you only have one month to try Windows 10 after an upgrade to be able to go back to 7. The OP said he's been on 10 for a few weeks. Not sure though if "few" weeks means 4 or more weeks. After a month, you are locked in to 10(?). Which means, you can't clean install 7 back because your Win 7 key is already locked in to Windows 10 license certificate which Microsoft calls "digital entitlement". I've never proven this myself because I never upgraded my old OS but that's my understanding of this whole upgrade circus. An upgrade does not alter your original key but rather uses your original key just to verify that you have a genuine OS which determines your eligibility for FREE upgrade. Then you will be issued a Windows 10 digital entitlement by registering a unique ID associated with your PC’s hardware on Microsoft’s Windows activation servers.
I never said Windows 7 stores product key in BIOS. :)
When I said "embedded in motherboard", that's my short way of saying that once you upgrade to Windows 10, the Windows activation server generates a Windows 10 license certificate which associates the Windows 10 License with your specific hardware, making a product key unnecessary.
Last edited by badrobot; 13 May 2016 at 13:46.