Welcome to Windows XP Service Pack 4 (Unofficial).
Windows XP SP4 (Service Pack 4) is a cumulative update rollup for Windows XP.
Windows XP SP4 Final is now available!
IMPORTANT NOTICE FOR XP SP4 USERS [08/03/2016]: Microsoft has changed its WU update detection strategy. The following key must be removed to continue receiving automatic updates from WU:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\WindowsEmbedded
Use the sp4_march16_wufix.reg found inside the respective zip file at my Google Drive in order to automate the process. Version 3.1a users don't need to do anything more than that.
A new v3.1b version has been released with this change, just for new installs. No other updates have been added.
Windows XP SP4 can installed on any version of Windows XP with SP1 or later installed or slipstreamed into any Windows XP installation source (except for Embedded versions). It includes all updated components and hotfixes for Windows XP in a single, convenient package. Except for the SP4 package installer main executable (update.exe) and a cosmetic resource modification sysdm.cpl no other binary file has been modified, everything is original from Microsoft Corporation.
Microsoft .NET Frameworks 4.0, 3.5, 1.1, 1.0 are included in this package. .NET Framework 1.0 will be installed only with Tablet PC Edition or Media Center Edition (Upgrade only). .NET Framework 4.0 is disabled by default.
It's possible to split the slipstreamed installation source into two 650 MB CD-ROMs, which can be essential for older computers. You can also create 6 Bootable Floppy Disks to install Windows XP on older systems which cannot boot from CD-ROM.
Furthermore, Windows XP SP4 includes security enhancements that address issues not fixed by Microsoft Updates. It also includes performance tweaks that should make your PC run blazingly fast.
NOTE: Before installing SP4 on a system with many post-SP3 updates installed, follow the steps described here (do not restart your PC after applying these steps, just run the SP4 installer and then reboot):
http://www.rarst.net/software/failed-install-catalog-files/
This will prevent a common error message: "Failed to install catalog files"
Although SP4 installer takes steps to automatically delete these files, it may require manual intervention in some cases.
Download at Windows XP SP4 development thread at RyanVM.net: http://www.ryanvm.net/forum/viewtopic.php?p=133918#133918
Visit RyanVM.net for additional information. (Current version: Version 3.1b Released on 08 March 2016 23:00:00 UTC)
Enjoy Windows XP Service Pack 4.
Screenshots:
This is Windows XP SP4 slipstreamed in a Windows XP MCE 2002 installation source. Notice the Version year.