Compaq CQ40-401AU XP Drivers

PATCH

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

Netframework 3.5
Download

DRIVERS (18)

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Sata
AMD SATA AHCI Controller Driver
Version 3.1.1540.64 REV:  A  5.24MB
Download

Graphic/VGA
AMD High-Definition Graphics Driver
Version:8.753.0.0, 178.42M
Download 

ATI VGA Driver (ATI Mobility Radeon)
Version:8.672.0.0 A, 106.21M
(strongly recommended to install Microsoft netframework 2.0 and 3.5)
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)

 If resulting in error, ignore it and proceed  by manually install the drivers:

Download and install the driver, you will get the error while  installing.
Perform the below steps to fix the issue.
1. Click on Start and select Run. Now type devmgmt.msc and press enter.
2. Right click on "Audio device on High Definition Audio Bus" and click  Update driver.
3. Select "Install from a list or specific location".
4. Click Next. Then select "Don't search, I will choose the driver to  install".
5. Click Next and then select "Sound, video and game controller" from  the list.
6. Click Next and then click Have Disk.
7. Click Browse C:\swsetup\sp39671 folder and select the .inf   file and click open and Continue with the onscreen instructions.

Fo instruction with pictures read here:
Manually  install Audio Drivers.

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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

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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


ADDITIONAL INFORMATION

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1. If  you have 7 unknown device, download this file, extract, then right click on the inf file and select install(Machine.inf)

2. If you need HDMI Driver Download 

3. Chipset driver can be download directly from AMD and in your graphic driver folder. By default the folder name is SMbus in c:\ati