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Hi,

when i start EasyUEFI i get the message "EasyUEFI can only install on UEFI based windows operating system."

My boar is a Asrock Z97 Anniversary and is UEFI-based with Windows 8.1. Why i cannot install EasyUEFI?
Most UEFI-based motherboards come with a Compatibility Support Module (CSM), which makes the motherboard actually look like a BIOS-based motherboard.
It sounds like that you have installed Windwos 8.1 in CSM (legacy BIOS) mode, so you cannot install EasyUEFI.