Installing Windows 8.1 Yosemite - cannot seem to do it.

Okay, so I have the fastest MBP Machine you can currently get as of 4/2015.
How in the heck does one install Windows 8.1 (any windows, for that matter.) Bootcamp helps me create the USB boot stick from a windows ISO, it creates the partition, but then - I get error messages.
- "windows could not prepare the computer to boot into the next phase of installation."
Someone please help. Is there a decent step by step solution to do this?
I've googled the heck out of this problem, and to no avail. I can't seem to crack it.

This is the only authoritative guide - How to install Windows using Boot Camp - Apple Support.
1. Are you using a USB2 flash drive?
2. Can you verify that the ISO is not corrupted?

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Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks.
Windows cannot be installed to this disk. This computer's hardware may not support booting to this disk. Ensure that the disk's controller is enabled in the computer BIOS menu.
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Michael Conelly wrote:
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I did it. After fours hours and two hours on the phone with Apple support, I installed Windows 8.1 to my iMac. So, I just wanted to share it with you.
System:
iMac 2013, 27" monitor, 1T fusion drive, wirless keyboard, magic mouse.
Software:
OS X 10.9
Windows 8.1 full version 64bit
(I skipped some steps such as type in software key, choose language, etc.)
1. For my last try, Instead of using Bootcamp assistant to setup partition for Windows, I used disk utility to create an 100G space for Windows with FAT file system and named it BOOTCAMP.
2. Insert Windows CD into the USB super drive.
3. Shutdown iMac.
4. While press and hold the left "option" key, turn on iMac.
5. Select CD/Windows icon to boot.
6. Choose Custom installation
7. Select the partition named BOOTCAMP (I am not sure why it is 200G; I assigned 100G. Well...)
8. Format
And the rest is history. By the way, when Windows restarts during installation, make sure to press and hold the left "option" key to boot up Windows.
I do not know why but I am happy now. As a matter of fact, I am sending this message from Windows 8.1 running on my iMac.
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Which step did the error start to occur ?Have you tried to install it again to have a check ?As the information stated, we can restart the machine to have a check.
Here is a link for reference of the requirements of the Windows 8.1 .
System requirements
http://windows.microsoft.com/en-HK/windows-8/system-requirements
There may be a hardware issue here, it is also recommended to look for help from the manufacturer for help.
Best regards
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Installing Windows 8.1 Yosemite - cannot seem to do it.

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