I am unable to hear anything on my system (Dell running Windows XP) I have the Master volume meter appearing on my screen all the time. Ive gone to the little speaker icon in my tasktray to open the master volume control. I checked to see if the WAV, MIDI or MASTER volume control has been muted or turned way down and they have not been. When I slide the Master volume slider to increase volume level it auttomatically slides back to zero. ANy suggestions?