Windows XP Service Pack 3 (SP3)
Microsoft’s Windows XP Service Pack 3 (shortly SP3) will be the latest and last update download from the Official Website.

Windows XP SP3
This is the new version of hot-fixes(update) as an Installation File, executable from Windows XP Operating Systems. It includes previous releases of Service Pack updates( SP1 and SP2) and latest security updates.
To download free service pack – you should visit official Microsoft website, which offers variety of options to do this. You may install as live update or choose from download location, otherwise Purchase an Installation CD kit from Recommended Merchants.
The Official Release date of Windows XP Sp3 is: 5th June, 2008
You can obtain Windows XP SP3 from Windows Update, at http://update.microsoft.com
The Overview of Windows XP SP3 available at http://download.microsoft.com/download/6/8/7/687484ed-8174-496d-8db9-f02b40c12982/Overview of Windows XP Service Pack 3.pdf
This update relate to: Performance, Security and Stability of Windows XP Operating System
System Requirements: Windows XP Home Edition, Windows XP Professional Edition, Windows XP Service Pack 1, Windows XP Service Pack 2
Update Version: 1
File Name: WindowsXP-KB936929-SP3-x86-ENU.exe
Update File Size: 316.4 MB
Default Language: English
Before going to install this service pack update you should aware of Problems occure if some critirias not up to the mark.
Direct download locations:
Microsoft Official Website Download Link1, Download Link2, Download Link3
Windows SP3 Previous Functionalities:
MMC 3.0, MSXML 6, Microsoft Windows Installer 3.1 v2 (3.1.4000.2435), Background Intelligent Transfer Service (BITS) 2.5, IPSec Simple Policy Update for Windows Server 2003 and Windows XP, Digital Identity Management Service (DIMS), Peer Name Resolution Protocol (PNRP) 2.1, Remote Desktop Protocol 6.1, Wi-Fi Protected Access 2 (WPA2).
Windows XP SP3 New and Enhanced Funtionalities:
“Black Hole” Router Detection, Network Access Protection (NAP), CredSSP Security Service Provider, Descriptive Security Options User Interface, Enhanced security for Administrator and Service policy entries, Microsoft Cryptographic Module, Windows Product Activation.