Windows XP Service Pack 3 (SP3) includes all previously released updates for the operating system. This update also includes a small number of new functionalities, which do not significantly change customers’ experience with the operating system.
This file is a CD image file for users who wish to create an update CD for Windows XP Service Pack 3, for example for offline installation by administrators.

http://download.microsoft.com/download/e/e/9/ee9d0116-c9fe-4fc2-b59c-406cbfb6d515/xpsp3_5512.080413-2113_usa_x86fre_spcd.iso

more info/other language :
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=2fcde6ce-b5fb-4488-8c50-fe22559d164e 

This DVD5 ISO image file contains the security updates for Windows released on Windows Update on July 8th, 2008. The image does not contain security updates for other Microsoft products. This DVD5 ISO image is intended for administrators that need to download multiple individual language versions of each security update and that do not use an automated solution such as Windows Server Update Services (WSUS). You can use this ISO image to download multiple updates in all languages at the same time.

http://download.microsoft.com/download/6/9/d/69d4d450-dc17-4d26-8548-42a0aa48dba3/Windows-KB913086-200807.iso

The Microsoft Windows Malicious Software Removal Tool checks computers running Windows XP, Windows 2000, and Windows Server 2003 for infections by specific, prevalent malicious software including Blaster, Sasser, and Mydoom and helps remove any infection found. When the detection and removal process is complete, the tool displays a report describing the outcome, including which, if any, malicious software was detected and removed. 

http://download.microsoft.com/download/4/a/a/4aa524c6-239d-47ff-860b-5b397199cbf8/Windows-KB890830-V2.0.exe