Replay Video Capture -audio problem

I am a Newbie Here. I need help. I just bought the whole suite and loved it until I played the captured video back. The audio cuts out on playback.The video looks great but the sound cuts out, off and on ,throughout the video.I tried putting resource usage on low on the converter and unchecked disable video acceleration on the capture screen but nothing helps. Odd thing is the only video that doesn't cut out on playback is the one I did in Demo Mode before purchasing. Please any help will be appreciated!
Linda

same problem - except with Demo.

No Unviersal Audio visible; just the (correct HDek Audio and HDTek Digital./ Latter only offers SOPID which is not allowed, so set to HDTek Audio; allows CD, Mic, Line. No playback with line. Mic plays back at much reduced volume