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I was attempting to install Arch Linux the other day, and managed to tank my partitions... Oh Well, let’s install windows again and use UEFI! I followed the guide here to install, but I kept getting the same error; 0xc0000225. I attempted to reinstall multiple times, with different partition layouts, but kept getting the same error. It took an hour of googling but I stumbled across this post, which details that you cannot have any MBR disks in your system, with a UEFI install.

To recap: If you’re installing a UEFI install of windows, you CANNOT have any MBR disks in your system or it will fail.