Please see:
How do I reset Windows Update components?
http://support.microsoft.com/kb/971058
Also, expert Windows Update support is available in the new Windows
Update Forum:
http://social.answers.microsoft.com/...istawu/threads
six-h wrote:
> About 2 weeks ago "updates" offered me "Vista SP2", (I'm running Ultimate
> SP1 at present) having heard various tales of woe about installing this I
> decided to decline the offer 'till I had investigated further.
> Now the dratted update doesn't show in those available for my machine!
> I am loathe to download the whole shebang since as I understand it, the
> version offered to each individual, is tailored to that specific machine and
> I want to give it a fighting chance of installing correctly!!
>
> Anyone know how I can coax MS Updates to offer it to me again?
> Updates says there are no new updates for my machine (except IE8 which I
> don't yet want and 39 language packs..no thanks!) also no hidden updates
> which I understand might block SP2 being offered...in spite of the fact that
> it has once been offered and nothing has changed in the meantime??
>
> what can I do?