Cant install SteamOS

My Machine: (older stuff)

CPU = Intel i7-930

Motherboard: EVGA X58 (SLI capable, don't remember the exact sub model name)

RAM = 6gb

Graphics = EVGA nvidia GTX 465 (SLI x2)

HDD = 1TB 7200RPM

SSD = 128gb

I had Windows 8.1, but something went wrong and now it my PC wont boot into windows until i put in a recovery disk. There is nothing on this computer but video games and i this point i would rather install SteamOS than repair windows.

I followed Valve's directions and created a bootable USB using my laptop (Macbook5 1 running Xubuntu 15.10) The boot disk works on my MacBook, but when i try to boot with it on my gaming computer i get stuck on the "Verifying DMI pool data....." screen

I never make it into the bootable SteamOS USB.