Just to add to add to the answer that jaf posted to you
Also see
http://support.microsoft.com/kb/941729/
--
Peter
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"Confused" <> wrote in message
news:%...
> The 'Windows Update' icon in the toolbar tells me that a update is available.
>
> Even though I tell it to install, it never does nor does the notice ever leave.
>
> The update is
> security update for Msoft xml core services 4.0 Service Pack2 kb954430
>
> but for some reason, the install never takes place.
>
> Whether I tell it to install upon closing down Vista or while Vista is running.
> I always get the same notice that this update should be installed.
>
> Can I fix this? Please.