way to search for laptop drivers

i refurbish a use laptop from my company for personal use, however the only fully functional laptop is NEC Versa M320... i manage to find every driver except audio... for some reason the driver provided by http://www.nec-driver.com/ doesnt work.i been searching for 2 days now, tried various of driver detection program such as driver detective and no success.so any idea how to find that audio driver?

dr hardware 2009 should tell you what the audio chip is, then you look on the manufacturer's site

well this is what dr.hardware provided me

Product Name: ALI M5451 PCI AC-Link Controller Audio Device
Unit: 5451
Vendor Code: 10B9
Vendor Name: Acer Labs
Sub Vendor: NEC
Sub Product: Device ID 8198h
PCI Type: Standard-PCI
RAM-ROM-I/O: 8800h(I/O) F0011000h(MEM)
Interrupt Pin: INTA
Int. Line (IRQ): 11

i been searching using "ALI M5451 PCI AC-Link Controller Audio Device" in google without any usable result (which i got from aida32)... most of the result i got either advertising page for driver detection program or unanswered post from people who are searching for it as well.

http://majorgeeks.com/ALi_Integrated_Driver_d4463.html

thanks but that doesnt work... like many other drivers that i have try, it have no sound (some dont even start the device).... i'm using a ear phone just to make sure it wasnt a speaker problem...