This option under Advanced Settings does not appear to be working on 64 bit Windows 8 Pro. I have modified some Intel Q45/Q43 Graphics Win 7 Drivers for installation on Windows 8 but they are unsigned. No problem I thought as I'd use the EasyBCD facility to force installation but even after doing this the drivers refused to install until I turned off the requirement using Windows Advanced Startup options.Just flagging this up really although I guess its not an often used feature.