GT70 - Win7 / Win8 BIOS - Confused + Questions

I tried posting this in the BIOS forum but I didn't get any responses. I'm not sure if I should have posted here first. Image may be NSFW.
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I have a GT70 Dominator Pro 890. It came with Windows 8.1 preinstalled. I don't want Windows 8.1; I'll be blanking the hard d...