Sound drivers

Hello,
sir my mother board is Machine name: UMAMAHES-7A1D09
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_rtm.040803-2158)
Language: English (Regional Setting: English)
System Manufacturer: z945c
System Model: z945c010
BIOS: MotherBoard Version: ZX-I945LM4 Ver: 1.5 BIOS SIZE: 4M Date: 01/15/09
Processor: Intel(R) Pentium(R) 4 CPU 1.60GHz
Memory: 1016MB RAM
Page File: 564MB used, 1881MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode