No sound coming from laptop since windows xp upgrade?

Hi there.i completly formatted my advent laptop two days ago.i installed windows xp in it.since then i havent been able to get any sound?i tried e thing i can think of to fix it but still nothing.at first though, when i put media playeron it was sayin that it could not play as this file may be getting used else where,but it wasnt definetly.now when i put media player on i hit play. . and it looks like it should be playing . .the sound bar is moving and my skins are playing but i still have nosound?any advise would be greatly appreciated.thankyou.
Answer
I had the same prob download drivers from the link i provide. also check everything is enabled first hope this helps.