Compaq Presario CQ40-605LA XP Drivers

First Install netframework 2.0 before others:
Net framework 2.0
Download

CHIPSET:
INF Update Utility - Primarily for Intel® 5, 4, 3, 900 Series Chipsets
Download (direct link)
Download (intel website)
Download(mediafire)

restart after chipset installation.

GRAPHICS:
if you have Nvidia Graphic
Nvidia GeForce G 105M/103M
Download

If you have intel graphic
Mobile Intel 45 Express Chipset Family Graphics Driver
Download

Intel matrix storage manager:
Download (intel site)
Download (mediafire)

AUDIO:
MS UAA (required with a reboot before Audio driver)
WIn XP SP2 Download
Winn xp sp3 Download

restart and inst IDT

IDT High-Definition Audio CODEC Driver
Download
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or try this driver reported work in xp
sp41693, here
sp39671, here
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If direct audio installation failed refer guide here.

Conexant HD AUDIO Soft Data Fax Modem with SmartPC
Download

WIRELESS:
Intel: Download
(requires windows installer 3.0 installed first)
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In case you have other wireless model:
Broadcom: Download

Atheros: Download (direct)
or here (atheros site)
===========================

CARD READER
JMB38X Card Reader Host Controller
Download

Ethernet:
choose one of the driver below:
ETHERNET:
Realtek RTL8102E Family PCI-E Fast Ethernet NIC
Download

Realtek RTL8101 Family PCI-E Fast Ethernet NIC
Download

Realtek RTL8168C Family PCI-E Fast Ethernet NIC, here
Download
(report back which work)

TOUCHPAD
Download

Lightscribe system software
Download

if you have webcam:
Cyberlink YouCam 2.0 Software,
here