No sound on TV nor computer using an HDMI cable.

Hello,



I just got a HD PVR 2 and a new TV for my xbox, after getting everything hooked up i tried to record some gameplay, but there was no game audio. Im using the arcsoft showbiz program that came with it, but i don't see how that would be the problem.
I looked all over the web to find an answer but got nowhere. I looked in the playback devices on my computer and tried to find the HDMI output; I tried to 'show disabled devices' but still nothing came up.
I'm just kinda burnt out looking for the answer I need to ask people who are actually good with this stuff.