Your Windows 8 installation using VirtualBox gave below error,
Your PC needs to restart. Please hold down the power button. Error Code: 0x000000C4 Parameters: 0x0000000000000091 0x000000000000000F 0xFFFFF80038F4BA80 0x0000000000000000
Solution
Upgrade the VirtualBox to the latest (version 4.3.2 – during this article was published). We encountered this error in VirtualBox 4.2.3.
An other fix is:
* In Linux type the following in a terminal:
VBoxManage setextradata [vmname] VBoxInternal/CPUM/CMPXCHG16B 1
* In Windows type the following in a command prompt:
“C:Program FilesOracleVirtualBoxVBoxManage.exe” setextradata [vmname] VBoxInternal/CPUM/CMPXCHG16B 1
NOTE: Be sure to replace [vmname] with the name of your virtual machine.
Also, using an IDE-controller for your HDD with an inflated disk might help.
Be sure to provide enough Memory to your VM
Don’t forget to enable PAE/NX
I’ve tried those thing but when i run the command it shows another error saying that VBoxManage.exe: error: could not find registered machine named ‘[server2012]’
my machine name is server 2012
so is it “server2012” or “server 2012″… Use “” if the name contains spaces