i recently tried in installing windows 8.1 into my Debian   Jessie via .  Installed from debian repo and windows installment goes fine but with no luck booting the system. Code is 0x000000C4.

Solution: Problem caused by missing CMPXCHG16B instruction set. So we should manage it from console. Close your virtual machine

and give the command below;

$vboxmanage setextradata virtualmachinename VBoxInternal/CPUM/CMPXCHG16B 1