On-site Windows 8 I've done, restarting the Mac and press alt, from the DVD two installers are read: EFI boot (it will give error) and Windows (similar to the two disks of the image), you select "Windows" so you do not error. If you select EFI Boot never work unless you delete the partition and create a bootcamp partition directly from the disk utility (no bootcamp). Then install EFI Boot, but from my experience the EFI asking windows 8 is not fully compatible with the mac EFI, and then Windows gives many problems ...