Windows Server 2008
For the Windows Update based security hotfixes and hotfixes to install properly, you need to make sure that you have the latest “Servicing Stack Update” for your corresponding O.S. Here are a list for the O.S. on the applies to section.
968440 When set to manual, TrustedInstaller service fails to install updates
Note: Not a hotfix
955430 Description of the Windows Vista and Windows Server 2008 installation software feature update released April 28, 2009
Note: "installation software feature update" is what became "servicing stack update"