My windows volume control does not work. I have sound and can adjust it from the speaker volume control, but my on screen volume control does not work. I am currently running windows xp professional, I see the volume bar move back and forth and I can even mute it, but it does nothing as far as controlling the sound output. My mobo has onboard sound and I have not gotten a sound card, and dont plan on it unless I have to. Any info would be appreciated.