Toshiba Satellite media control buttons question!

I have a Toshiba Satellite a215-S4757 notebook with Windows Vista. Above the “F-keys”, there are media control buttons, such as play/pause, stop, previous, next, a media player button, an internet button, and the power button. The power, internet, and media player buttons work. The media control buttons (play/pause, stop, previous, next) do not work. I might also add that they used to work.

Is this a driver program? The other buttons in the row work, which leads me to believe it might be something to do with my sound card? Any ideas?