I hate to say this but I had the same thing happen with an Analog Devices chip today
EDIT: One difference - the sound device was properly installed and functioning once setup was done. But again, I got the two blank cmd windows around T-34.
re: the two cmd windows, I think this may be due to two missing exes started by
presetup.cmd
here are the last two lines from an autoimage+driverpacks ris setup
START %WDSP%
START %CDSP%
aka WatchDSP.exe and CloseDSP.exe. I couldn't find any sign of these binaries, presumably they are not part of driverpacks anymore but autoimage still references them??