Macbook not working during installation of windows 8.1

Hello,
I am installing Windows 8.1 on my 15" Macbook with Retina Diaplay using the bootcamp.
The Windows 8.1 cannot be installed and said that the boot information cannot be changed and the Macbook hanged.
After switch off, then on again, even the OS X cannot be loaded, only a grey screen then switch off automatically.
Kindly could you please advise what is happening and what I can do? Do I need to bring it to the Apple Shop to fix it? Will they help me to install the Windows 8.1?
Thanks.
Kwong

Are you using Boot Camp to attempt to install Windows?
https://www.apple.com/support/bootcamp/

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