Windows XP Service Pack 3 (SP3) includes all previously released updates for the 32-Bit versions. Windows XP 64-Bit users will want the Windows XP and Server 2003 Service Pack 2 as the last XP 64-bit Service Pack.
Using WSUS Offline Update, you can update any computer running Microsoft Windows and Office safely, quickly, and without an internet connection. Development appears to have stopped. There is now a fork called WSUS Offline Update Fork available here.
If windows updates are not working then this repair may help. This will reset windows updates and get all the windows update files registered. These utilities are part of Windows Repair and no longer updated. MajorGeeks recommends you download the complete Tweaking.Com Windows Repair instead.
Reset Windows Update Agent is designed to reset Windows Update, but it can also run diagnostics and fix other typically related issues with Winsock, registry and more. Video tutorial and Reset Windows Update Tool are also available.
Windows XP and Server 2003 Service Pack 2 - 64-Bit is the final service pack for Windows XP and Server 2003 64-Bit. Microsoft Windows XP Service Pack 3 - 32-Bit is only available if you have the 32-Bit editions of Windows XP.
wufuc disables the "Unsupported Hardware" message in Windows Update, allowing you to continue installing Windows 7 and 8.1 systems updates with AMD Ryzen, Intel Kaby Lake, or other unsupported processors. Project has been abandoned.
WinUpdateFix is a tool that can fix some problems linked to Windows Update primarily with Windows XP, Vista and 7. It is also written in French so you might want to use WindowsUpdateFixer which is in English and works with Windows 10 and 8.
Windows Update Cache Cleaner is a simple, freeware app designed to clear the Windows Update cache and hopefully resolve Windows Updates when it is stuck in a loop, for example downloading updates are stuck at 95%.
InControl allows you to take control of Windows updates, especially Feature Updates, Windows 10 to 11 updates, or any Windows update that installs without your consent. Developed by Gibson Research Corporation, the author of Never10, and many other popular security utilities.