Try this line under [sourceDisksFiles]: viasraid.sys = 1,,,,,,4_,4,1,,,1,4 Also, make sure you have the path to the driver defined in the OEMPnPDrivers key of winnt.sif. If all else fails, the pack I created (linked in my sig or the pinned thread) has support for that controller and automatically patches txtsetup.sif properly.