First you have to uninstall the audio (sound driver) then install this then install the sound driver
Microsoft Windows XP SP2 Universal Audio Architecture Update (Q888111)
This package provides the Realtek High-Definition Audio Driver for the
supported desktop models and operating systems.
NOTE: Refer to the Prerequisites section for important information regarding
the installation of this driver. Users creating their own disk images must
first install the Microsoft Universal Audio Architecture (UAA) driver before
installing the Realtek driver. The Microsoft UAA driver provides the necessary
support for the high-definition (HD) audio bus used by the Realtek HD audio
CODEC. Users who are upgrading to this newer driver on an existing system,
should ensure that the UAA driver is already installed on your system. The UAA
driver may be listed on your system as the ''High Definition Audio Driver
Package.''
The sound driver:
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