After doing a bit of research trying to get windows 8 working in emulators/virtualbox-ose I found out that you have to enable extra data from the command line. This has to be done every time you want to fire it up. I wrote a real simple script so I didn't have to do this every single time.
Where "Windows 8 x64" is whatever you named this VM.
Set the script as executable
Bam, WIndows 8 in VirtualBox.
Code:
#!/usr/local/bin/bash
VBoxManage setextradata "Windows 8 x64" VBoxInternal/CPUM/CMPXCHG16B 1
VirtualBoxWhere "Windows 8 x64" is whatever you named this VM.
Set the script as executable
chmod +x ./vbox.sh and then run the script # ./vbox.sh.Bam, WIndows 8 in VirtualBox.