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Compaq Presario CQ series here including CQ40, CQ35 and CQ45. This method also applicable to other model which use IDT audio drivers. For other CQ model which use Conextant audio the patch installation and method is similar, the difference is you need to locate conextant audio drivers.
Last update: June 14 2013

PATCH INSTALLATION

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If you already install ms-uaa you may skip this step.
 Before proceed with audio Installation you need to install Microsoft Universal Audio Architecture first. Below is the patch you needed.

Microsoft Universal Audio Architecture (MS-UAA)

Windows XP, XP SP2:  Knowledge Base 888111 (KB888111)
Download 

Windows XP SP3:Knowledge Base 835221 (KB835221)
 Download  (KB835221)

This downloads also available in Microsoft website, you just need to search the KB888111..etc.


DOWNLOAD AND INSTALL: IDT AUDIO DRIVERS

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I provide few driver version here which reported work in most CQ40. The trick is simple, you just need to get your original vista drivers first. Here is the recommended and tested driver version.

SP39671.exe: Download - recommended (original xp driver for IDT)
SP41693.exe: Download 
SP45100.exe: Download
SP41616.exe: Download
 
Now Install the driver you selected from the list above or your original vista drivers. (do not restart) If the installation successful with no error, try any audio file for confirmation. If it resulting in error, or no sound after successful installation proceed with next step.

MANUALLY INSTALL DRIVER

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This manual installation is also know as "have disk method".

1.First open device manager by click start and select run type "devmgmt.msc" as shown in the pictures below.



2.Below you will see there are many drivers with yellow, select the Audio with the yellow mark, right click on it and select update driver.



3. Harware update wizard screen will appear, select no to connect, next


4.Select Install from list specific location, next


5. select dont searh i will choose the driver to install, next

6.then select all drivers on the next screen then make sure you uncheck the "show compatible drivers" box, select have disk

7. then select browse:


8. Then browse to the directory c:\swsetup


9. Ok in this step i will show for SP39671 audio. So after open the swsetup folder select the SP36971 Folder. If you use other audio make sure to select the folder name similar to yours example: sp45100.




10. After open the SP39671, there 3 folder and select the wdm folder. For other audio driver maybe you will have the similar folder or different, Important to remember we a re looking for files ended with INF extension. Here for SP39671, after open the folder slect WDM folder and Select WInXP folder




11. Then select the STHDA.INF (STHDA64.INF is for 64 bit) anyway press OK . Ignore if XP Complaint. then try to play some music (suggested simple mp3, no rmvb, flv or other player that require codec).

INF file may have different name if you are using different driver version

In case the audio driver you have and i gave earlier didn,t work leave your comments and i will assist you for further instructions.


HDMI and NO SOUND AFTER RESTART

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Some model will have issue with HDMI. To know either you have this issue or not, Simply after driver installation above a "new hardware found" windows appear. Download this driver first:
SP39545.exe

Now install this this driver first (do not close a new hardware found windows), after finish install, get back to the "a new hardware found windows" follow the audio installation we did earlier until we get the inf file.

In case the Audio Disappear After restart follow the Guide here:

AUDIO DISAPPAER AFTER RESTART: PART 1
AUDIO DISAPPAER AFTER RESTART: PART 2

Your Audio is:
Conexant CX20468-31 AC97

to install the driver there are some method you need to do.
note: just try to update driver manually by:

- Opened device manager (right click on my computer and select manage, search for device manager at the left)
- Right click - On the audio(with yellow mark) right click and select Update Driver Software
- select no to search online, select manually install driver, select dont search i will choose the driver to install adn next browse to c:\swsetup\sp30399
- Clicked Next

IF THE METHOD ABOVE DIDN'T WORK, FOLLOW THIS STEPS:

1. Download driver sp30399! You can get it from here: Download

2. Run the exe

3. Go to the extraction folder (Default: c:\SWSetup\SP30399)

4. Edit qta3091.inf:
Search code block:
[Conexant]
%*WDM_AMCAUD.DeviceDesc%=WDM_AMCAUD,PCI\VEN_1002&DEV_4370&SUBSYS_3091103C

and add this line under:
%*WDM_AMCAUD.DeviceDesc%=WDM_AMCAUD,PCI\VEN_10B9&DEV_5451&SUBSYS_0024103C&REV_02

So the result would look like this:
[Conexant]
%*WDM_AMCAUD.DeviceDesc%=WDM_AMCAUD,PCI\VEN_1002&DEV_4370&SUBSYS_3091103C
%*WDM_AMCAUD.DeviceDesc%=WDM_AMCAUD,PCI\VEN_10B9&DEV_5451&SUBSYS_0024103C&REV_02

Attention! I've copied this part from the device manager:
"PCI\VEN_10B9&DEV_5451&SUBSYS_0024103C&REV_02"

You may have a different device description. If you wanna be sure, go to the device manager, open the unrecognized audio device's property page, select "Details" tab, and select "Hardware Ids" from the Property combo! Copy any of the listed strings and replace it with my device description!

So the final result would look like this (if you have different device desc.):
[Conexant]
%*WDM_AMCAUD.DeviceDesc%=WDM_AMCAUD,PCI\VEN_1002&DEV_4370&SUBSYS_3091103C
%*WDM_AMCAUD.DeviceDesc%=WDM_AMCAUD,HERE COMES YOUR DEVICE DESCRIPTION
5. Now all you have to do is to install the driver manually through device manager like the first method i posted above with blue font

Credits: MR. RAVEN

I created this post to cover the failure of sound installation for Compaq Laptop after downgrade to XP. This post basically for Compaq Presario CQ35-216TU and since this post is still new, you feedback are important.

MS-UAA
(install before audio, restart after installation)
http://ftp.hp.com/pub/softpaq/sp33501-34000/sp33867.exe

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1. Conexant High-Definition SmartAudio 221 Driver
http://ftp.hp.com/pub/softpaq/sp34001-34500/sp34200.exe

Unzip to a folder (using winrar)..use Device Manager,right click "Audio Device on HD",choose Update driver,
No to connect,
Install from a list or specific location,
Select Don't Search, I will choose the driver to install,
For the Hardware Type select 'Show All Devices'
Remove the check from "Show Compatible Hardware" and click on "Have Disk".
Next...browse to the unzipped folder and choose the "WiSVHe5.inf".
Ignore XP when it complains.
Reboot.

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VERSION 2: IDT-hidh definition audio codecs


IDT High-Definition Audio CODEC Driver,

1. sp41693, vista driver, reported work in XP
ftp://ftp.hp.com/pub/softpaq/sp41501-42000/sp41693.exe

2. sp39671, vista driver, reported works in XP here
ftp://ftp.hp.com/pub/softpaq/sp39501-40000/sp39671.exe


High-Definition Audio (HDA) Modem
ftp://ftp.hp.com/pub/softpaq/sp39501-40000/sp39671.exe

ADDITIONAL NOTES:

SOUND DISSAPEAR AFTER RESTART:
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1. Try using this ms-uaa:
ftp://ftp.hp.com/pub/softpaq/sp42001-42500/sp42126.exe
-------------------------------------------------------------

2- Using devcon:
If you found the sound was not working after restart, do the following steps

1. Download devcon command line utility,
http://support.microsoft.com/kb/311272

2. Extract and copy the file to c:\windows\devcon\i386\devcon.exe

The command line as: C:\windows\devcon\i386\devcon.exe restart "PCI\VEN_8086&DEV_293E&SUBSYS_3607103C&REV_03"


Notes:

1. The location of devcon.exe is in c:\windows\devcon\i386\devcon.exe if you change it, you need to edit idt.bat

2. "PCI\VEN_8086&DEV_293E&SUBSYS_3607103C&REV_03" is hardware ID for MS-UAA, if you found it in a different name change it.

3. Place idt.bat in c:\Documents and Settings\All Users\Start Menu\Programs\Startup

4. The sound will be restore within 6-10 seconds, because of that there is NO sound of XP start-up
(note: if this method failed, remove devcon utilities)

This guide is based on a user which use this guide and worked:

When he tried to turn volume up, the volume will be going to down slowly? If you have same problem, you may have to follow below step instruction to solve the problem:
a. You have to uninstall Alienware Command Center
b. Uninstall OSD Utility
c. You have to reinstall Alienware Command Center and OSD Utility to your alienware notebook. You can get file from here and here
d. If this problem still appear, you may have to schedule check your C drive (Automatically fix error and recover bad sector on your hdd)
e. If the problem still occurs, you may have to shut down your computer, unplug your notebook, take out the battery for 10 or 15 seconds, after 15 seconds, plug your battery and plug AC power and turn on your notebook.