audio device problem

hello,

I couldnt able to hear any sound including the system sound also.In device manager multimedia audio controller and video controller are displayed with yellow question mark under other devices.

In control panel it tells no audio device and also no volume mixer.
If i try to open any audio file in windows media player it tells "Windows Media Player cannot play the file because there is a problem with your sound device. There may not be a sound device installed on your computer, it may be in use by another program, or it may not be functioning properly."

I have installed tv tuner card in my compfor the puporse of streaming.


Under sound, video and game controllers i have got the followinglist

Audio codecs
Btcap, WDM audio capture
Btcap, WDM video capture
BtTuner,WDM tuner
BtXbar WDM crossbar
Legacy audio drivers
Legacy video capture drivers
Media control devices
Vedio codecs


And in Btcap, WDM audio capture no audio drivers were installed. i tried with reinstall but it is asking cd. i dont have cd and also i dont know the location.

My computer details:

--------[ Motherboard ]-------------------------------------------------------------------------------------------------

Motherboard Properties:
Motherboard ID 63-0100-000001-00101111-062403-iSPGDL_G$BF865001_BIOS DATE: 06/24/03 18:12:36 VER: 08.00.09
Motherboard Name Intel Bay Field D865GBF

Front Side Bus Properties:
Bus Type Intel NetBurst
Bus Width 64-bit
Real Clock 200 MHz (QDR)
Effective Clock 800 MHz
Bandwidth 6400 MB/s

Memory Bus Properties:
Bus Type DDR SDRAM
Bus Width 64-bit
Real Clock 133 MHz (DDR)
Effective Clock 267 MHz
Bandwidth 2133 MB/s

Chipset Bus Properties:
Bus Type Intel Hub Interface
Bus Width 8-bit
Real Clock 67 MHz (QDR)
Effective Clock 267 MHz
Bandwidth 267 MB/s

Motherboard Physical Info:
CPU Sockets/Slots 1
Expansion Slots 6 PCI, 1 AGP
RAM Slots 4 DIMM
Integrated Devices Audio, Video, LAN
Form Factor ATX
Motherboard Size 240 mm x 300 mm
Motherboard Chipset i865G

Motherboard Manufacturer:
Company Name Intel Corporation
Product Information http://www.intel.com/design/motherbd/index.htm
BIOS Download http://www.intel.com/design/motherbd/genbios.htm




Multimedia info

In multimedia there are two types:

1.Windows audio
2.PCI/PnP audio

In windos audio there are no devices at all

in PCI/Pnp audio the following result i have got
--------[ PCI / PnP Audio ]---------------------------------------------------------------------------------------------

BrookTree Bt878 Video Capture Device - Audio Section PCI
Intel 82801EB ICH5 - AC'97 Audio Controller [A-2/A-3] PCI



Thanks in advance


with regds
selva