Compaq Presario CQ40-401TX Windows XP Drivers

Install .Net Framework before others:
Download

INTEL Chipset.
filename: infinst_autol.exe
INF Update Utility - Primarily for Intel® 5, 4, 3, 900 Series Chipsets
Download (direct link)
Download (intel website)
Download(mediafire)

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

AUDIO:
Install MS-UAA first:
both ms-uaa sp33867 and kb888111 are similar files.
Windows XP SP2: Download (SP33867.exe)
Download (KB888111)
Windows XP SP3: Download (KB835221)

Then restart, and install AUDIO Drivers:

IDT - High Definition Audio Codecs (SP39671)
Download (ftp)
Download (mediafire)
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or try this drivers reported work in xp
SP41500 Download (ftp)
Download (mediaifre)

SP41616 Download(ftp)
Download (mediaifre)
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First install your audio.
Installing the Audio normally resulting in error, ignore it and proceed by manually install the drivers, read the guide here;
Manually install Audio Drivers.
High-Definition Audio (HDA) Modem Installer and Driver
Download

Windows Installer 3.1(required before wireless)
here:
Download

If you have Intel PRO/Wireless Drivers
here:
Download

if you have Broadcom Wireless
here:
Download or
Download

Realtek RTL8102E Family PCI-E Fast Ethernet NIC
here:
Download

JMB38X Card Reader Host Controller Driver
Download

ENE CIR Receiver (vista version)
Download

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:
Download

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

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