Compaq Presario CQ40-131TU Drivers For Windows XP

Net framework 2.0
Download

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

restart after chipset Installation.

AUDIO:
Install MS-UAA and restart.
MS-UAA:

Download (KB888111)
Download (sp33867.exe)
Both KB888111 and SP33867 have the same funtion, recomended use KB888111.

after restart install this drivers:

High Definition Audio ceodec
sp39671.exe
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(alternate download link)
Download (ftp)
Download (hp) 
Download (ziddu)
=================

VGA/GRAPHIC:
Mobile Intel 45 Express Chipset Family Graphics Driver
Intel graphic accelerator 4500MHD
Download

Modem:
High-Definition Audio (HDA) Modem
Download (sp39545)

WIRELESS:
Choose one of the wireless driver base on your specs, if you dont know, just try each driver (there are no risk and will not harm your system)
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Broadcom: Download

Intel: Download
(requires windows installer 3.0 installed first)
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ETHERNET:
Realtek RTL8102E Family PCI-E Fast Ethernet NIC
Download
if above didn't work try:
Download

HP Quick Launch Buttons
Download

ENE-CIR Reciever:
Download

CARD READER
JMB38X Card Reader Host Controller
Download