KB Article: http://support.microsoft.com/kb/956708
When you try to install updates by using the Windows Update or Microsoft Update Web site, you may receive the following error message:
You may experience this problem if one or more of the following conditions are true:
- You repair your Windows XP Service Pack 2 (SP2) installation by using the Windows XP SP2 CD. Then, you install Windows XP Service Pack 3 (SP3) before you update the Windows Update software to the current version.
- You perform a clean install of Windows XP SP2. Then, you install Windows XP SP3 before you update the Windows Update software to the current version.
- The current version of Windows Update is not installed and registered correctly.