laptop dual boot on legacy bios, please help.

Hello, I just installed OS X El Capitan with legacy bios (I don't have UEFI bios on my laptop) on GUID partition(The usb flash drive installer was MBR) with legacy clover.

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Now, I want to install windows 10 on the same drive on another partition.

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Since the disk is GUID I must to make the installer of windows GUID too, but beacause I have legacy bios I can't boot to the usb flash drive installer.

If I make the usb flash drive installer on MBR partiton I can boot to the installer but I can't Install the windows because the disk is GUID.

What should I do?

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thanks :)