hi can some1 plz help me i hav the same problem...i am gettin NO SOUND AT ALL ..i just reformated my comp nd in the part were its add hardware multimedia audio controller, Universal serial Bus & Video Controller hav all got teh yellow question mark thing and i dont know wat to do i really need help

i have an icom computer nd windows xp pro,....nd i read a couple of the advice things nd they talk about a sound card nd i dont know what a sound card is im completly computer cluless
HELP PLZZZZZZZZZ!!!!