I have a PB pentium 120 with a PB sound card/wavestream. It has its full duplex option disabled by default on the device manager. It works fine with different net phones on this half duplex mode. However, when I enabled the full duplex option on the device manager, the net phone does not work with an error message stating 'error in input...', something like that. Anyone can help me to solve this problem? I do have an Aztech drive but it is not selected. Will switch to this drive solve the above problem? How to switch?