Fix Windows 8 install error VirtualBox

[TOC]

Fix the 0x000000C4 install error when trying to install Windows 8 or Windows Server 2012 in VirtualBox

This is mainly written for Mac as that is what I use, but should work on every OS.

How to fix

First we need to get the names of your Virtual machines:

VBoxManage list vms

Then we will get the following example output:

"XP" {f1bd07df-aa36-43ec-8335-8afaa45fed6e}
"Windows 8 64" {18e20ca4-4de1-4b80-a164-b4863ebf5081}

Now to fix the error on the Windows 8 Machine:

Vboxmanage setextradata "Windows 8 64" VBoxInternal/CPUM/CMPXCHG16B 1

Now it should work :)