Have you run this:
http://support.microsoft.com/kb/947821
Description of the System Update Readiness Tool for Windows Vista, for
Windows Server 2008, and for Windows 7
This article describes the System Update Readiness Tool for Windows
Vista-based computers, for Windows Server 2008-based computers, for Windows
Server 2008 R2-based computers, and for Windows 7-based computers. Microsoft
released the System Update Readiness Tool to resolve certain conditions that
could cause installing updates and other software not to work. You do not
have to manually run this tool. This tool is offered automatically through
Windows Update to computers that have a condition that the tool could resolve.
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Disclaimer: The information has been posted "as is" with no warranties or
guarantees and doesn''t give any rights.
"Suzi" wrote:
> Microsoft .NET framework 3.5 SP1 & .NET framework 3.5 family update
> (KB951847) x 86 has failed everytime that its updated for the past month.
> I've gotten error code 800B0100 and followed the Windows Update Error
> instructions. At one point I thought it was installed, but still shows
> "failed". I am running a Windows Vista 32-bit version and have never
> encountered a problem with any automatic updates until now. My system will
> run slow, but I have no viruses. Using Norton Internet Security and that is
> running well. I've spoken with my Geek Squad and we've done system restores,
> etc. and this update still fails!!! Any suggestions? directions? will be
> greatly appreciated.
>
> --
> Suzi