u may want to consider looking into the xboxhdm_v1.9 tools loocated under tools > hdd tools
the driver.exe is way out of date and is buggy. u should do some more research on how to look for your eeprom (liveinfo.exe) to find your hdd key. and use hdunlock and hdd disable to unlock and disable the lock of the hdd. then u can insert files and edit your ms dash.
before installing your hdd again to your xbox. its absolutely necesary to lock your hd again and use a password....probably better using the master password (xboxscene)
if your soft modding and want to install a new bios to the tosp, u need to look at your xbox version number and solder (v1.2 and higher) 2 drops of soldier) or (v1.0,1.1) with the sharp chip it gets more complicated.
good luck. unfortunatly my liveinfo gave me the wrong eeprom hdd password and i am trying to find information on how to locate it
more info and tutorials on soldiering to enable tosp flashing in the tosp flashing forum