Windows 8.1 Guest on VirtualBox 0x000000C4 Error, Guru Meditation

To fix on an x64 machine:

1. cd /d “c:\Program Files\Oracle\VirtualBox”

2. vboxmanage setextradata “[vm name]” VBoxInternal/CPUM/CMPXCHG16B 1

3. Close VirtualBox and re-open. Windows 8.1 installation should now succeed.

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