First Install Netframework:
Net framework 2.0
Download
Compaq Presario CQ40-504LA BUTTON Driver
HP Quick Launch Buttons
Download
INTEL CHIPSET:
Compaq Presario CQ40-504LA CHIPSET Driver (xp, vista, 7)
INF Update Utility - Primarily for Intel® 5, 4, 3, 900 Series Chipsets
Download (intel website)
Download(mediafire)
(optional Install)
Intel matrix storage manager:
Download (intel site)
Download (mediafire)
GRAPHIC
Compaq Presario CQ40-504LA Graphic XP Driver
if you have intel graphic:
Mobile Intel 45 Express Chipset Family Graphics Driver
Intel graphic accelerator 4500MHD
Download
If you have Nvidia graphic:
NVIDIA GeForce G 103M/ G 105M Graphics Driver (186.81 WHQL XP 32-bit)
Download
FOR NVDIA: if resulting in error use modded driver below:
Download
3-step process to install:
1. Download driver, double click and select extract,
2. Download modded INF and replace original INF in extracted folder,
3. Install and reboot.
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AUDIO:
Compaq Presario CQ40-504LA Windows XP Driver
=====================================
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)
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
WIRELESS:
Compaq Presario CQ40-504LA Wireless XP Driver
=====================================
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)
---------------------------------------------------------
Broadcom: Download
if error try newer version -
Broadcom BCM9431HMG
Broadcom: Download
Intel: Download
(requires windows installer 3.0 installed first)
=================
BLUETOOTH:
Compaq Presario CQ40-504LA XP Bluetooth Driver
HP Integrated Module with Bluetooth Wireless Technology
Download
WIRELESS SOFTWARE
HP Wireless Assitant:
Download
ETHERNET:
Compaq Presario CQ40-504LA LAN/Ethernet Driver
Realtek RTL8102E Family PCI-E Fast Ethernet NIC
Download(direct) or Download
CARD READER
Compaq Presario CQ40-504LA Card Reader Driver
JMB38X Card Reader Host Controller
Download
Compaq Presario CQ40-504LA Touchpad Driver
ALPS Touchpad
Download
Synaptics Touchpad
Download
Download
WEBCAM
Compaq Presario CQ40-504LA XP Webcam Driver
Cyberlink youcam software 2.0
Download
LIGHTSCRIBE:
Lightscribe system software
Download
If you have 7 unknown device:
Unknown devices:
Download
Unzip files, open folder and right click at machine.inf, select install.