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

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