Audio Help Realtek Audio no output?

GAP3R Ki113R

TS Rookie
My audio went hay wire and im not sure how to fix it, i look at all the speaker settings on the master volume and nothing is muted. i think i update the drivers i just dont no if i did it right. if anybody can help. by telling me the steps or even giving me bedder idea of a better audio program. if it helps you to help me i do have Realteks Audio Manager. this system is all new to me because my big brother wants me to get into building computers and gaming so he gave me his old rig i'm new to it

if it help this is my rig

motherboard Gigabyte GA-P35-DS3L

Graphics card EVEA Ge force GTX 260

System Microsoft window XP
-home Edition
-Version 2002
-Service Pack 3

Computer Intel(R) Core (TM) Duo

Please help Me