When you install Windows Server 2012 R2 preview, you may get the following error,

Your PC needs to restart.
Please hold down the power button.
Error code: 0x000000C4
Parameters:
0x0000000000000091
0x000000000000000F
0xFFFFF801E5962A80
0x0000000000000000

Solution

The solution of the problem is straight forward, run the following command on the host computer:

"c:\Program Files\Oracle\VirtualBox\VBoxManage.exe" setextradata [vmname] VBoxInternal/CPUM/CMPXCHG16B 1

Replace [vmname] with the name of your machine.

Windows Server 2012 R2 on VirtualBox – Error 0x000000C4

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