problème de son

bonsoir,

j'ai un hp pavillon m7770.nl .
avant je n'avais pas de pilotes pour ma nvidia (7500) mais je les ai trouvé.
Le seul problème c'est que je n'ai pas reussi a mettre le son .
voila ma config:

Système d'exploitation
Windows XP Professionnel (build 2600) Service Pack 2
Navigateur web par défaut: Mozilla Firefox
Carte mère
SMBios version 2.4
ASUSTek Computer INC. NODUSM3 1.05
Bios: Phoenix Technologies, LTD 5.04 12/15/2006 taille: 512Kb
Processeur
AMD Athlon(tm) 64 X2 Dual Core Processor 5200+ (2605Mhz) (L1: 128ko L2: 1024ko )
Chipset
Northbridge: NVIDIA C51
Southbridge: NVIDIA nForce 410/430 (MCP51)
Mémoire
Barette de 1024 Mo 667 Mhz None
Barette de 1024 Mo 667 Mhz None
mémoire windows (cette valeur ne correspond pas exactement à la mémoire totale physique): 2046Mo
Lecteurs CD/DVD
HL-DT-STDVDRRW GSA-H30L S655
Disque dur
ST3320820AS (298.09Go)
Generic USB CF Reader USB Device
Generic USB MS Reader USB Device
Generic USB SD Reader USB Device
Generic USB SM Reader USB Device
Cartes PCI/AGP
Stockage
nVidia Corporation:MCP51 IDE
nVidia Corporation:MCP51 Serial ATA Controller
nVidia Corporation:MCP51 Serial ATA Controller

Réseau
Atheros Communications, Inc.:AR5006X 802.11abg NIC

Affichage
nVidia Corporation:G72 [GeForce 7500 LE]

Multimedia
nVidia Corporation:MCP51 High Definition Audio
Philips Semiconductors:SAA7133/SAA7135 Video Broadcast Decoder

Mémoires
nVidia Corporation:C51 Host Bridge
nVidia Corporation:C51 Memory Controller 0
nVidia Corporation:C51 Memory Controller 1
nVidia Corporation:C51 Memory Controller 5
nVidia Corporation:C51 Memory Controller 4
nVidia Corporation:C51 Host Bridge
nVidia Corporation:C51 Memory Controller 3
nVidia Corporation:C51 Memory Controller 2
nVidia Corporation:MCP51 Host Bridge
nVidia Corporation:MCP51 Memory Controller 0

Ponts
nVidia Corporation:C51 PCI Express Bridge
nVidia Corporation:C51 PCI Express Bridge
nVidia Corporation:MCP51 LPC Bridge
nVidia Corporation:MCP51 PCI Bridge
nVidia Corporation:MCP51 Ethernet Controller
Advanced Micro Devices [AMD]:K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Advanced Micro Devices [AMD]:K8 [Athlon64/Opteron] Address Map
Advanced Micro Devices [AMD]:K8 [Athlon64/Opteron] DRAM Controller
Advanced Micro Devices [AMD]:K8 [Athlon64/Opteron] Miscellaneous Control

Bus Series
nVidia Corporation:MCP51 SMBus
nVidia Corporation:MCP51 USB Controller
nVidia Corporation:MCP51 USB Controller
Agere Systems:FW323

Périphérique USB
FreeBox SA FreeBox 4
Alcor Micro Corp. Mass Storage Device
Saitek PLC Saitek Game Mouse
Chic Technology Corp. USB Device
Clavier
Périphérique clavier PIH
Souris
Souris HID
Souris HID
Ecran(s)
Philips 107S (107S1)(Philips Consumer Electronics Co. PHILIPS 107S)

comment faire?
merci.