Zook...this might be an easy fix. You need to change your settings so that QQ is pointing at your camera/mic. To do this, make sure you are not using your mic/cam, as it won't work if either are being used, or trying to be used.
Beside the mic button is a pulldown arrow. And also beside the camera button is a pulldown. Either one should work. Use the pull down menu, and click on Video Settings...or Audio Settings...depending on which one you clicked. Go through this, and make sure the right things are clicked..meaning, that it is all pointing to your web cam, and your mic. In my case, my camera and mic are part of the same unit.
Once you are done this, try connecting again. Failing this, check your firewall settings.