Hi everyone! So, I figured I'd give Windows 8 a go on my MBP, which has a SSD and a data doubler with my old hard drive in it instead of the optical drive. I managed to get BootCamp 5 to create a bootable USB drive with a Windows 8 Pro x64 ISO with the BootCamp drivers - all fine there. I figured EFI booting would be the way to go, so I repartitioned my hard drive using Disk Utility - apparently no hassles there. However, I'm running into an error when I try to boot from the USB drive. When I hold down option on boot, I see the drive labelled as "EFI Boot". I select it, and the screen goes black with blue Windows logo (so far so good!). After 10 seconds or so a white progress indicator shows up, but after spinning once or twice it freezes. Suddenly, a wild BSOD appears! The standard text stays there for a few seconds; it only flashes the error for a split second before rebooting. It turned out to be "IRQL not less or equal". Obviously my google fu isn't quite up to scratch at the moment; after looking around I still don't have any answers. I thought it might have been a bad stick of RAM, but I've tried each stick individually (as well as some other RAM which I'm reasonably confident is fine) with no luck. I also thought that the transfer to the USB drive might not have worked properly, but I've used a couple of different drives. I've also checksummed the ISO, so I know the ISO isn't corrupted at all. So I turn to you, Mac Rumours denizens. Can you help me? ---------------------- TL;DR: Windows 8 installer gives a BSOD Error "IRQL not less or equal"; probably not bad RAM or installation media. Any ideas?