This question should be asked in the Windows Answers Forum at the following address
http://answers.microsoft.com/en-us/windows/forum/windows_update
Anyway, I suggest you to provide more detailed informations about your system and the faulting updates.
Also read the page that you find at
http://windows.microsoft.com/en-US/windows-vista/Troubleshoot-problems-with-installing-updates.
Try using the System Update Readiness tool: read the Microsoft Knowledge Base article
947821.
If this tool does not solve your problem, reset the Windows Update components: follow the instructions in the Microsoft Knowledge Base article
971058.
Bye.
Luigi Bruno - Microsoft Community Contributor 2011 Award