audio driver for system model: AWRDACPI
manufacturer: MSTEST
PROCESSOR: intel(R) Pentium(R) 4 CPU 2.66 ghz
BIOS: Phoenix- AwardBIOS v.6:00PG
Microsoft Windows xp professional (5.1, Build 2600)
Firstlt, have a look on the motherboard near the audio output and see if you can identify the chip by sight. If you cannot identify the chip I recommend downloading driver pack solution for free from here:
The lite version will identify the missing drivers and offer you a download link, the full version contains all the driver packs. I have the full version burnt to a DVD and it is really useful for drivers for older systems.