Compaq CQ40-421TU Windows XP Driver

This driver still in testing purpose, if you download and install this software, I hope you can report back which driver didn't work.

.Net Framework(required before Q.L.) here

AUDIO DRIVER

LSI High-Definition Audio (HDA) Modem here

First install:
MS-UAA (before IDT audio, model and ATI HDMI drivers), here
(reboot recomended)

Then High definition Audio CODEC
ftp://ftp.hp.com/pub/softpaq/sp41501-42000/sp41693.exe
or
1. sp41693, vista driver, reported work in XP here
or
2. sp39671, vista driver, reported works in XP here or here
or
3. http://tinyurl.com/m6334j

(since i never installed driver in this modem i hope u can try install the sound driver using the force method)

Chipset here (First install this and reboot)

Intel Matrix Storage Manager here

Graphic Intel 4500MHD here

Broadcom Wireless here


HP Quick Launch Buttons here

Realtek 8102E LAN here

JMB38X Card Reader Host Controller Driver here

Cyberlink YouCam Software here

Bluetooth: ftp://ftp.hp.com/pub/softpaq/sp38501-39000/sp38983.exe


If you had for 7 unknown devices (buttons drivers) here

Do manual installation

Go to device manager, right click unknown device,

Choose to update driver, No to connect,

Choose install from a list or specific location, Don't search, Have disk,

Browse to the location of machine.inf.

Do it for the rest of unknown devices