So I'm trying to dual boot Windows 7 and El Cap on my 1,1 Mac. Why am I getting a "Windows 8 is not supported on this Mac" message when I'm using a freaking OEM Windows 7 DVD. I'm quite confused, wondering if anyone else has ran into this. Have all the supporting software on a USB, so that's good to go. I'm just at the portion when it asks me to partition one of my drives.