Try holding down the shift key when you click 'Shutdown' from windows. This should force a true shutdown rather then the fastboot version and then on the next power up you should see the usual 'Press Del to enter setup' type prompt.
Try holding down the shift key when you click 'Shutdown' from windows. This should force a true shutdown rather then the fastboot version and then on the next power up you should see the usual 'Press Del to enter setup' type prompt.