for this particular drivers, you need to install either KB835221 or KB888111 (both are for HD Audio Bus, and are needed for windows to detect your audio chip) depending on your motherboard implementation. try intalling it manually and see if any of this updates are installed along with the driver (chances are high). then grab the one that is being intalled by the setup and install it via winnt.sif in the GuiUnattended section like this: [GuiUnattended] DetachedProgram="%systemdrive%\Drivers\KB835221.EXE" -> this is for a limited number of motherboards. Arguments="/Q /O /Z" then, use the drivers in the OemPnPDriversPath section of winnt.sif. if you are unsure how to do this, read the unattended guide for directions.