that probably is the correct icon, is the sound device selected as default, go to control pannel look for the sounds and audio devices
icon, click on it and on the audio and voice tabs make sure that they are set to the sound card.
Did you disable the onboard device in the bios? It might also be worth looking in your services menu and see if anything sound related has been disabled, go to start run then type services.msc
look for windows audio, anything to do with the sound card and any services associated with the headset or mic.
If these don't work, you could try replacing the shell32.dll http://www.dll-files.com/dllindex/dll-files.shtml?shell32