Dell Service and install audio driver for Dell D-420 NB

Dell Service Call
(02)2376-6888 (Taipei)

goto the zip extracted folder as following
C:\dell\drivers\R171789\HDAQFE\win2k_xp\us

run the driver installation program
1. qfe.exe
2. kb835221.exe

C:\dell\drivers\R171789\WDM
3. suhlp.exe (If Windows is 64 bits, run suhlp64.exe)