Try this:

You should find a speaker icon on the bottom-right corner of your screen
• RIGHT-click that icon and select "playback devices" or "recording devices" - whichever applies.
• Click on the device you want - make sure its status says "ready"
• Click on the "set default" button below.
• Click "OK"

I think I'm looking at standard Windows 7 software, but your results may vary. It could be what I'm looking at, is proprietary to my sound card.

Good luck.

-Joe-