Take a look at the Microsoft Security Bulletin Search tool to determine which updates you'll need to download. Here are the settings I recommend to get all of the relevant updates after post-SP3. Then it's just a matter of downloading the relevant install executables for offline use.

The Windows XP SP3 is primarily a package of previously released updates, security updates and hotfixes. However, a test run by Devil Mountain Software, says it boosts performance. The latest
Service Pack 3 is not available for Windows XP x64 Edition, which is based on the Windows Server 2003 kernel and, as a result, uses its service packs rather than the ones for the other editions.
hpgSL.
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  • what is windows xp service pack 3