CAE Oxford aviation academy R/T CD Rom problem
 

I have just received CAE Oxford VFR RT Communications CD Rom disc.I have a problem with the record and playback ,facility when trying to record and play back my own voice. When I press record the yellow line goes along the top box O.K depending on the strength of my voice,I then press stop,BUT when I press Record,it instantaneously says playback finished,without me hearing any sound at all.Any suggestions what is wrong?