Hi, I am not able to get any sound

can you please help?
Operating System System Model
Windows XP Professional Service Pack 3 (build 2600) Enclosure Type: Desktop
Processor a Main Circuit Board b
1,80 gigahertz AMD Athlon 64
128 kilobyte primary memory cache
256 kilobyte secondary memory cache Board: K8T800-8237
Bus Clock: 201 megahertz
BIOS: Phoenix Technologies, LTD 6.00 PG 04/27/2004
Drives Memory Modules c,d
163,91 Gigabytes Usable Hard Drive Capacity
68,38 Gigabytes Hard Drive Free Space
_NEC DVD_RW ND-3500AG [CD-ROM drive]
3.5" format removeable media [Floppy drive]
Maxtor 6 Y160M0 SCSI Disk Device (163,92 GB) -- drive 0 512 Megabytes Installed Memory
Slot 'A0' is Empty
Slot 'A1' is Empty
Local Drive Volumes
c: (NTFS on drive 0) 41,94 GB 18,02 GB free
e: (NTFS on drive 0) 121,97 GB 50,36 GB free
Network Drives
None detected
Users (mouse over user name for details) Printers
local user accounts last logon
Senozeti 29.12.2008 16:04:21 (admin)
local system accounts
Administrator never (admin)
Guest never
HelpAssistant never
SUPPORT_388945a0 never
DISABLED Marks a disabled account; LOCKED OUT Marks a locked account
HP LaserJet 1100 (MS) on LPT1:
Lexmark E120 V on USB001
Microsoft Office Document Image Writer Driver on Microsoft Document Imaging Writer Port:
Controllers Display
Standard floppy disk controller
Primary IDE Channel [Controller]
Secondary IDE Channel [Controller]
VIA Bus Master IDE Controller RADEON 9200 SERIES [Display adapter]
RADEON 9200 SERIES - Secondary [Display adapter]
Proview PS-976D [Monitor] (19,1"vis, april 2004)
Bus Adapters Multimedia
VIA Serial ATA RAID Controller
VIA Rev 5 or later USB Universal Host Controller (4x)
VIA USB Enhanced Host Controller Realtek AC'97 Audio for VIA (R) Audio Controller
Standard Game Port
Communications Other Devices
SoftV92 Data Fax Modem
Marvell Yukon Gigabit Ethernet 10/100/1000Base-T Adapter, Copper RJ-45
primary APIPA Address: 169.254.142.181 / 16
Physical Address: 00:04:61:68:0F:70
Networking Dns Servers: 217.72.64.10
217.72.64.11
Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Logitech USB Wheel Mouse
USB Printing Support
USB Root Hub (5x)
Nokia E71