Why is Windows Update showing updates that have already been applied?

[Timothy Bartlett]

I'm currently running some xp sp3 machines that require some updates a few .net fw updates and a root certificate update. When I click Install Updates they do install and then it tells me they completed. seconds later the yellow shield comes up and requires the same updates i just installed. I don't get an error either.
Any help will be greatly appreciated.
Thank You.

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