Hi Izan Hamzah..
To Reinstall the Audio device follow the steps :
->Open the Device Manager and see if your device is working properly.
->To get to the Device Manager, click the Windows "Start" menu, choose "Control Panel," select "System and Maintenance" and choose "Device Manager."
->Find your audio device in the list. Right-click the device and choose "Uninstall."
->Reboot your computer. When your computer starts up it should recognize the hardware and reinstall your audio device.
I am sure this will gonna work out....
Read more: Reinstalling Audio Devices in Windows XP | eHow.com
http://www.ehow.com/how-does_4811444_reinstalling-audio-devices-windows-xp.html#ixzz2QWh63Y26