security update kb954430 won't install.

I have tried many things, like downloading it manually. I have read other forums, who say to uninstall the existing 954430 update (in Add or Remove Programs) and reinstall. There is no existing one.

When I install manually, it comes back with an error message: HKEY_LOCAL_MACHINE\Software\Classes\MSXML2.DOMDocument.4.0\CLSID verify that you have sufficient access to that key.

Help! I am trying to install SP3, and it will refuse that, too, because an update is not installed.

I am just running a plain version of Windows XP Home.


Question Info

Last updated March 25, 2018 Views 778 Applies to:

See the "How to obtain help" and "Known Issues" sections of  

Visit the Microsoft Virus Solution and Security Center for resources and tools to keep your PC safe and healthy. If you are having issues with installing the update itself, visit Support for Microsoft Update for resources and tools to keep your PC updated with the latest updates. 


What anti-virus application or security suite is installed and is your subscription current?  What anti-spyware applications (other than Defender)?  What third-party firewall (if any)?

Has a(another) Norton or McAfee application ever been installed on the computer (e.g., a free-trial version that came preinstalled when you bought it)?


WinXP SP3 - Read all prerequisites for a successful installation 

Free unlimited installation and compatibility support for WinXP SP3 was available from 14 April 2008 thru May 2009.  Such support will cost you $59 USD or more per incident now.

Note: Extended Support for WinXP (x86) SP2 ends on 13 July 2010. After that date, computers running WinXP (x86) SP2 will NOT be offered any further critical security updates, Automatic Updates will not work, and Windows Update website will not be accessible until SP3 is installed.

What does it mean if my version of Windows is no longer supported?

~Robear Dyer (PA Bear) ~ MS MVP (IE, Mail, Security, Windows & Update Services) since 2002 ~ Disclaimer: MS MVPs neither represent nor work for Microsoft
~Robear Dyer (PA Bear)
Microsoft MVP (Windows Client) since October 2002

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