windows:
终端
$VBoxManage setextradata "win8.1" VBoxInternal/CPUM/CMPXCHG16B 1
<enter>
linux:
cmd
"VBoxManage.exe" setextradata "win8.1" VBoxInternal/CPUM/CMPXCHG16B 1
<enter>
windows或linux下用Virtualbox安装Win 8.1等系统错误0x000000C4解决办法
原文：http://blog.csdn.net/ngforever/article/details/40076697