If you really want speakers with an optical input, buy some.
But guess what? Optical connections will not make any difference in sound quality, if you are running the signal a short distance, like 6 feet, 10 feet, 25 feet. Even if you run the signal 50 feet, you will probably be just fine.
Optical connections start to make sense when you are running an audio signal for a very long distance, like 50-100 feet or more. That's the time that you need to start considering losses in the transmission path.
Plug the speakers into the GREEN jack, in the back of your computer.
Buttons Malfunctioning: Clean the controls, see THIS forum, first post on the top.