Sound driver problem?

i have no sound even after installing realtek drivers,it shows this error (microsoft bus driver should be loaded in your system)help me!!!!!!!!!!!!!!

my pc specifications
COMPANY :lenovo
PROCESSOR :INTEL(R) PENTIUM(R) 4
SYSTEM MODEL :AWRDACPI
SERIES :3000 h series
OS :ms windows xp professional sp3
BOARD :intel pentium 4
CPU :3.20 GHZ
RAM :512MB
DIRECTX VERSION:directx 9.0c(4.09.0000.0904)
BIOS :phoenix-awardBIOS v6.00pg
 
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