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    VirtualBox - Cannot install Win 8.1 Pro, Error 0x000000C4

    Hi, Host OS: Windows 7 Ultimate x64 on SSD system disk. PC Specs: Intel Core i7 3770K on ASRock Z77 OC Formula with 16GB DDR3, GTX470 VirtualBox version: 4.3.12 r93733 with Extension Pack 4.3.12 r93733. I've had a Windows 8.1 Pro x64 VM running on VBox 4.3 for a few days now with no issues at...