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I've never had this happen but MS does have a hot-fix for no Windows Update after installation of SP3 {snip}
That looks like the fix from MS WebSite:
http://support.microsoft.com/default.aspx/kb/943144
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Scenario 1
This problem occurs because of how the Windows XP repair operation replaces Windows system files. When you repair a Windows installation by using a Windows XP CD, the repair operation performs both of the following operations:
It replaces all the Windows system files with the corresponding files from the CD.
Note This includes the Windows Update files.
It restores the Windows registry.
The latest version of Windows Update includes a file that was not available in the release version of Windows XP. This file is named Wups2.dll. Therefore, after the repair operation is complete, the following situation exists:
The Wups2.dll file remains on the computer.
The registry entries that correspond to this file are missing.
Because the registry files that correspond to the Wups2.dll file are missing, update installations are unsuccessful.
Scenario 2
This problem occurs when the latest Windows Update client has been installed and then you install Windows XP SP3 before restarting the computer. This causes the new Wups2.dll file not to be enabled (registered). When Windows XP SP3 is installed, it does not detect the Wups2.dll file, and it sets the registry to point to the original Wups.dll file version that is included in Windows XP SP2 and Windows XP SP3. Because the registry files that correspond to the Wups2.dll file are missing, update installations are unsuccessful.