Try downloading VLC Media Player. I'm almost willing to bet that you're not getting any audio. With the HD camera, there are some particular settings on the playback programs that can cause problems.
"To be persuasive we must be believable; to be believable we must be credible; to be credible we must be truthful." Edward R. Murrow
Thou shalt not steal. I mean defensively. On offense, indeed thou shall steal and thou must.--Branch Rickey