Do you have a microphone built in? Is the microphone volume up? Check the volume settings in your computer, you can access them by going to control panel in the start menu, and click sounds, speech, and audio devices. Good luck!
You can use BlazeVideo Video Magic ,It is best video converter includes video editing, video converting - AVI, MP4, MPEG, H.264, WMV, 3GP, ASF converter.You can Accord to the operation instructions to use.