windows 8.1 error while runing in virtual box video

while runing Windows 8.1 or Windows 2012 R2 in VirtualBox or VMWare where the installation cannot proceed due to an error telling you to reboot. There is also an error code 000000C4 or 000000C5. what you just need to do is to power off it and run the below commands in comand prompt "c:\Program Files\Oracle\VirtualBox\VBoxManage.exe" list vms after this command replace "VM Name" with the name that occores in comand prompt "c:\Program Files\Oracle\VirtualBox\VBoxManage.exe" setextradata "windows 8.1" VBoxInternal/CPUM/CMPXCHG16B 1 don't forget to like or comment ------------------------------------------------------------------------ new to Ubuntu go here to get most http://abhinavkhajuria.blogspot.in/2013/12/thing-s-you-can-do-with-ubuntu-there.html ---------------------------------------------------------------------------------------------------------------