CQ40-108TU and CQ40-121TU Windows XP Driver

You have Four options:

1. Buy a USB floppy disk drive, make a floppy with the drivers, and point windows to that when you see "Press F6 if you need to install third party drivers" on the bottom of the screen. This is least desirable, as you will probably need the floppy drive and disk again.

2. If the computer recognizes the USB ports on boot (not all Intel based systems do), then you can put the drivers on a USB thumb drive and point windows to it as above. Better option than #1, as you can use the thumb drive again, but it depends on of your motherboard sees the USB ports on boot.

3. Best option is to slipstream the SATA drivers into your installation media. Suggest you google "slipstream WIndows XP'. and slipstream SP3 while you are at it.
You can also slipstream other drivers, such as LAN, Audio, Video, etc.

4. using Nlite Software to install windows XP on you notebook

for ICH9 sata driver.
A good guide to sliptream sata driver
here: http://maxeasyguide.blogspot.com/2008/04/preparations-for-winxp-installation-cd.html

Drivers for CQ40-118tu & CQ40-121tu

Intel Chipset,(install and reboot before other drivers):
http://tinyurl.com/54r6dt

MS UAA (required with a reboot before Audio an video (HDMI) drivers)
here:
ftp://ftp.hp.com/pub/softpaq/sp33501-34000/sp33867.exe

Important note:
After reboort, please confirm the installation by checking in Device Manager under System Devices to see if MS UAA installed properly.

There should be a listing for Microsoft UAA Bus Driver for High Definition Audio.

If not, you should have a PCI with yellow!.
Right click it and Update Driver,
No to Connect, No to Search and last Install Automatically.

Mobile Intel 45 Express Chipset Family Graphics driver, (confirm MS-UAA before installing) here:
http://tinyurl.com/48lunj

IDT High-Definition Audio CODEC Driver
(confirm MS-UAA before installing)
here:
ftp://ftp.hp.com/pub/softpaq/sp39501-40000/SP39671.exe

or

ftp://ftp.hp.com/pub/softpaq/sp39001-39500/sp39457.exe

or

ftp://ftp.hp.com/pub/softpaq/sp40501-41000/sp40714.exe

Note: the release notes of those drivers were for VISTA, if the automatic installation does not work, you need to installed it manually.

Look inside the extracted driver, i.e ...\sp40714\WDM\WinXP\

High-Definition Audio (HDA) Modem Installer and Driver (confirm MS-UAA before installing)
ftp://ftp.hp.com/pub/softpaq/sp39501-40000/sp39545.exe

Windows Installer 3.1(required before wireless)
here:
http://tinyurl.com/9cg2y

If you have Intel PRO/Wireless Drivers
try here:
ftp://ftp.hp.com/pub/softpaq/sp39001-39500/sp39251.exe

or

if you have Broadcom Wireless
here:
ftp://ftp.hp.com/pub/softpaq/sp39501-40000/sp39912.exe

Realtek RTL8101E Family PCI-E Fast Ethernet NIC Driver
http://tinyurl.com/4ssd97

ALPS Touchpad Driver
ftp://ftp.hp.com/pub/softpaq/sp25501-26000/sp25796.exe

.Net Framework(before Quick Launch):
http://tinyurl.com/758p8

HP Quick Launch Buttons
ftp://ftp.hp.com/pub/softpaq/sp40001-40500/sp40139.exe

JMB38X Card Reader Host Controller Driver
ftp://ftp.hp.com/pub/softpaq/sp40001-40500/sp40221.exe

ENE CIR Receiver (vista version)
http://tc.versiontracker.com/product/redir/lid/1508335/CIR.zip

or
From intel site
http://tinyurl.com/5jyoq6

If you have Bluetooth,
The HP Integrated Module is your Bluetooth Wireless
here:
ftp://ftp.hp.com/pub/softpaq/sp38501-39000/sp38983.exe

If you had for 7 unknown devices (buttons drivers)here:
http://www.mediafire.com/?nnnzjmojcjy

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

Good luck.