Sound issues than game freezing?

Hey, not sure if anyone else had this ever happen to them but when you start the game no sound is present, that includes the announcer and the timer beeping. All the guns make different sounds (which I assume is the alternate fire for when a player is far away)and the only movement sound is jumping. The rest of the game is quite. When the Eagle shows at the end of the game, my disk freezes. This has happened to me twice now, both in custom games. Has anyone ever had this happen to them, or know how to fix this?