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#11
I wouldn't worry about the error if you've disabled Secure Boot. Remember to Save the setting before exiting or it won't be remembered.
Go ahead and install Win7 so we can see if you need any adjustments, i.e. Turn off Fast boot to use BIOS Boot Menu so that Windows Boot Manager can be set first to boot, or Launch CSM as is sometimes needed to install Win7 even with UEFI.