HP Pavilion a6244n Windows XP Driver

The problems when try to downgrade Vista to Xp in HP Pavilion a6244n Desktop PC is no HDD not detected. what you need to do is:

When you boot into the BIOS, you can change the HD controller from SATA to
IDE. Even though you have a SATA hard drive in your system, it will work
with no need to load drivers by pressing F6.


Chipset:
Intel Chipset Installation Utility for ICH7 (945G)
Version:7.2.2.1006 A, 1.07M
Download 

Intel Matrix Storage Manager
Ver 7.8.0.1012 20.53MB
Download

Graphic
Nvidia GeForce 8300GS
http://www.nvidia.com/object/winxp_169.21_whql.html

Audio
Realtek High Definition Audio Driver
http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PFid=24&Level=4&Conn=3&DownTypeID=3

Keyboard
Fall 2006 Original HP Multimedia Keyboard/Mouse Drivers
Version1.0.2.6, 2.19M
Download

You can also use this fall original driver for audio and graphic:

Fall 2006 Original NVIDIA Unified Graphics Drivers 
Version9.1.3.2, 29.24M Download


Fall 2006 Original Realtek High Definition Audio Drivers 
Version5.10.0.5282, 19.32M Download