Windows Server 2012: Why cant I install Windows Server 2012 RTM on a Virtual Box?
I encountered this problem today while setting up a SharePoint 2013 Development environment. The solution is to run a simple command: "C:\Program Files\Oracle\VirtualBox\VBoxManage" setextradata [vmname] VBoxInternal/CPUM/CMPXCHG16B 1 For example, my Virtual Box was called SP2013, so my command was: "C:\Program Files\Oracle\VirtualBox\VBoxManage" setextradata SP2013 VBoxInternal/CPUM/CMPXCHG16B 1