Actually I have a very simple easy solution. It is very possible to have multiple audio outputs in win7.
Well at least for this persons issue. I am the same way, I want to watch movies on my tv through the pc via hdmi but dont want to hear the sound of stuff on the pc through the tv speakers or vice versa. So here is the simple solution.
If you use windows media player for watching the video its very easy.
- open windows media player
- right click, click tools, then options
- click devices tab
- click speakers, then properties
- select audio device (select HDMI output)
- click ok, then ok again.
All sounds through windows media player will now be played through the hdmi output and all other sounds from vlc media player, youtube, etc. will continue to play through the pc speakers.
It took me about 2 weeks to find that out. But it works.