[newbie] sound problems with "creative sound blaster live 1024"

[arro]

tech details :
creative sound blaster live 1024 under LM8
VIA Technologies,Inc VT82c686 [Apollo Super AC97/Audio]
Creative Labs SN live! EMU10000

while i can play cd's directly , i cannot play any mp3 or videos ,...lol well i can 
play them but just don't get sound !!!