Compaq Presario CQ40-616TU Windows XP Drivers

First Install  Netframework: (require for Quick Launch Installation).
Net framework 2.0
Download

Chipset
Intel Chipset Installation Utility
Version 9.1.1.1015 A 2.2MB (xp, vista, 7)
Download

Storage
Intel Matrix Storage Manager Driver
Version:8.9.2.1002 A, 18.17M
Download 

Graphic/VGA
Mobile Intel 4 Series Express Chipset Family Graphics Driver
Version 1.00 REV A 19.28MB
Download

Nvidia GeForce G 105M/G 103M For windows XP
Version 2.66.58WHQL  118MB
Download

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Audio Drivers:
Since there are no best single driver available, you have to follow this step carefully.

1. Install MS-UAA first:
Windows XP, XP SP2: Download  (KB888111)
Windows XP SP3: Download  (KB835221)

Restart and then install audio drivers below.

2. Install the Audio:
IDT High Definition Audio Codec
(2 drivers, if the first one didn't work, use 2nd drivers)
Download (SP41693)
Download(SP39671)

Wireless:
(3 drivers, choose 1 base on your specification)

Broadcom 4313 a/b/g/n wireless Drivers
Version5.10.91.8 10MB
Download

Intel PRO/Wireless Drivers:
(requires windows installer 3.0 installed first)
Version 5.20 4MB
Download

Atheros Wireless LAN Driver:
Version 2.00B 20.64MB
Download

Bluetooth:
HP Integrated Module with  Bluetooth Wireless Technology
Version 5.1E  94.68M
Download

Modem
High-Definition Audio (HDA)  Modem Installer and Driver
Version 1.00 A 12.71MB
Download

Lan/Ethernet
Realtek RTL8102E Family  PCI-E Fast Ethernet NIC
Verison 1.00A 4.8MB
Download
updates available here 

Card Reader
JMB38X Card Reader Host Controller
Version 1.00A 3.49MB
Download

Touchpad:
Synaptics Touchpad Driver
Version:9.1.11 Q, 16.93M
Download

Button:
(Install netframework 2.0 first)

HP Quick-launch Button
Version 6.40B 19MB
Download

Camera
Cyberlink youcam software 2.0 + Driver
Version 2.0.2519 46MB
Download

Others
Lightscribe  system software
Version 1.18.1.1 A 8.4MB
Download