Windows XP SP3 High Definition Audio Driver and Modem Missing

Anyone tried a fresh install of windows xp sp3 may face a problem installing sound and modem driver.. Its because SP3 doesn't have system bus driver for High Definition Audio devices. It was KB835221 (for SP1) or the KB888111 (for SP1 or SP2). both wont work on SP3. I faced this problem when downgrading a hp dv 6790 laptop from windows vista to xp.
Before installing ur audio driver u have to install this from device manager. Download it from the link

Download

Extract the zip file. Then go to device manager u will find a device with a yellow question mark device on other devices . right click and upgrade the driver from specific location . browse to the folder where you extracted zip archive. complete the installation. Now u can install the audio driver without any problems

Note: Its only of High Definition Audio chipsets.