My Vi8 running Windows 8.1 has 2 problems (which may be related);
1)The windows 8.1 Device Manager shows an error under Other Devices: Universal Serial Bus (USB) Controller: “The Drivers For This Device Are Not Installed (code 28)”. All drivers under Universal Serial Bus Controllers (Generic USB Hub, Intel USB 3.0 extensible Host Controller – 0100 (microsoft), USB Mass Storage Device, USB Root Hub (xHCI)) show no error.
2)The BIOS does not show an option to boot from USB. (Secure Boot is Disabled in BIOS)