please i need help...like others i reinstaled my windows bud the sound wont work...

(( i got this information from everest...
Version EVEREST v2.20.405
Homepage
http://www.lavalys.com/
Report Type Report Wizard
Computer XXX-9E18C1141A4
Generator Korisnik
Operating System Microsoft Windows XP Professional 5.1.2600 (WinXP Retail)
Date 2009-11-06
Time 19:26
--------[ Summary ]-----------------------------------------------------------------------------------------------------
Computer:
Operating System Microsoft Windows XP Professional
OS Service Pack Service Pack 3
DirectX 4.09.00.0904 (DirectX 9.0c)
Computer Name XXX-9E18C1141A4
User Name Korisnik
Motherboard:
CPU Type Unknown, 1600 MHz (16 x 100)
Motherboard Name Unknown
Motherboard Chipset Unknown
System Memory 1024 MB
BIOS Type Award Modular (01/12/07)
Communication Port Communications Port (COM1)
Communication Port Printer Port (LPT1)
Display:
Video Adapter ATI Radeon HD 2400 PRO (256 MB)
Video Adapter ATI Radeon HD 2400 PRO (256 MB)
Monitor Plug and Play Monitor [NoDB] (HMCP640737)
Multimedia:
Audio Adapter ATI HD Audio rear output
Audio Adapter Modem #0 Line Playback
Audio Adapter Realtek HD Audio output
Storage:
IDE Controller Intel(R) ICH8 2 port Serial ATA Storage Controller - 2825
IDE Controller Intel(R) ICH8 4 port Serial ATA Storage Controller - 2820
SCSI/RAID Controller AAOOSP3T IDE Controller
SCSI/RAID Controller GIGABYTE GBB36X Controller
SCSI/RAID Controller SCSI/RAID Host Controller
Disk Drive Generic USB SD Reader USB Device
Disk Drive Generic USB MS Reader USB Device
Disk Drive Generic USB SM Reader USB Device
Disk Drive Generic USB CF Reader USB Device
Disk Drive SATA WDC WD16 SCSI Disk Device (149 GB)
Optical Drive JOVU DMR0TAJGT SCSI CdRom Device
Optical Drive TSSTcorp CDDVDW SH-S222A SCSI CdRom Device
Optical Drive YO2142C LNP765W SCSI CdRom Device
SMART Hard Disks Status Unknown
is there anyone who konws what sholud i instal or what should i do ??? thanks