Hypercam does not record sound. If your computer can not handle Fraps or Bandicam, use Camtasia Studio. But if you are having a sound issue with Fraps, make sure "Record Win7 sound is checked, "Stereo" is checked, and "Record external output is unchecked. Those are my settings, and they work for me. If it still doesn't work for you, it might be the general audio settings on your computer.