I got the same error message. It doesn’t matter if you install from the ISO or the VHD. You always get:
Your PC needs to restart.
Please hold down the power button.
Error code: 0x000000C4
Parameters:
0x0000000000000091
0x000000000000000F
0xFFFFF801E5962A80
0x0000000000000000
The solution to the problem is this command:
"c:\Program Files\Oracle\VirtualBox\VBoxManage.exe" setextradata [vmname] VBoxInternal/CPUM/CMPXCHG16B 1
You have to replace vname with the name of your Virtual Machine which you can find in the VirtualBox interface or with this command:
"c:\Program Files\Oracle\VirtualBox\VBoxManage.exe" list vms
Don’t forget to set the VM name in quotes if it contains blanks.
The command enables the CPU instruction CMPXCHG16B. More info here.
I tried it with the VHD of Windows Server 2012 R2 Preview and it with the ISO.
