Problem CQ40 with windows XP

Your model needs AMD sata driver to be sliptreamed onto XP CD installer.

If you did it right, you'll pass BSOD error.

Use Nlite to slipstream AMD sata driver.
A good guide to sliptream sata driver, here

Note: Do NOT use sata driver from that guide, your sata driver is given below.

AMD SATA AHCI Controller Driver, here

or

if you wish an AMD SATA driver from HP site, here

extract sp39719 to a folder and use files in RAID7xx folder

Note:

Select ONLY x86 driver for AMD SATA AHCI

Nlite download, here

Make your Vista Recovery cd/dvd if you haven't yet, found out here

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Try the following drivers,

XP Drivers for CQ45-310AU

Install .Net Framework before others, here

Catalyst Software Suite (for your ATI Chipset, HD 3200 Graphics/Video, and LAN Drivers, here

Installing Audio is the most difficult part, since BIOS incompatibility.

Install MS-UAA first, here

IDT High-Definition Audio CODEC Driver,

I just noticed SP39671 has been deleted from HP ftp site.I dont know why.

SP39671.exe has been known running well in XP, I'll update my first post for alternative download from mediafire, here

If you wish to try some new drivers of IDT sound chip that has reported working in XP, try:

1. sp41398, here

2. sp41693, here

Note:

Some of CQ45 and CQ40 users need to update their BIOS to solve Audio that disappeared after rebort.

If you found your BIOS is lower than F33A, update your BIOS to the latest version, here

High-Definition Audio (HDA) Modem Installer and Driver, here

Broadcom Wireless, here

Realtek RTL8102E Family PCI-E Fast Ethernet NIC, here

JMB38X Card Reader Host Controller Driver, here

ENE CIR Receiver (your Vista driver), here

or if it does not work try Vista driver verified from Intel, here

HDMI Audio, here

ALPS Touchpad Driver, here

HP Quick Lauch Buttons, here

If you had Bluetooth, here

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

Do manual installation

Go to device manager, right click unknown device,

Choose to update driver, No to connect,

Choose install from a list or specific location, Don't search, Have disk,

Browse to the location of machine.inf.

Do it for the rest of unknown devices