Compaq Presario CQ40-126AU Windows XP Driver

Drivers CQ40-126AU --> Pleaseeeee download and Install according to Order given Below.

Install .Net Framework before others:
Microsoft .NET Framework Version 2.0 Redistributable Package (x86)
Download

ATI Radeon HD 3200 Graphics/Video Driver
Download

MS UAA (required with a reboot before Audio driver)
Download

IDT High-Definition Audio CODEC Driver
Download
or
Download

or try this new driver


High-Definition Audio (HDA) Modem Installer and Driver
Download (update) or
Download --original download link (reported broken)

Windows Installer 3.1(required before wireless)
here:
Download

If you have Intel PRO/Wireless Drivers
here:

if you have Broadcom Wireless
here:

Realtek RTL8102E Family PCI-E Fast Ethernet NIC
here:

JMB38X Card Reader Host Controller Driver
Download

ENE CIR Receiver (vista version)
Download

for HDMI Audio
Download

ALPS Touchpad Driver
Download

or try this new driver (not sure it will work)
Download

HP Quick Launch Buttons
Download

If you have Bluetooth,
The HP Integrated Module is your Bluetooth Wireless
here:

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


Installation --> right click machine.inf, choose install.

You may need to update your BIOS to solve IDT sound driver problem.
You may found all of your BIOS versions
here