Sound Problem

Hi. I can play EOC just fine on my computer, but I can’t seem to hear any of the voices in-game. Sometimes, it’s just fragments of the dialogue I hear, and sometimes nothing at all. Since there are automatically subtitles, it’s not a fatal issue, but I’d like to be able to hear stuff rather than having to look up every time. Also, there’s no sound for the CG movie where Cal is getting in the cockpit everytime. My computer exceeds all the system requirements, I updated all my drivers, and still I have this problem. Any suggestions?