You need to Update manually to solve this error
Go to the links below and download the file(s) and then install manually
Microsoft Download Center
http://www.microsoft.com/downloads/Search.aspx?
or, Microsoft Update Catalog
http://catalog.update.microsoft.com/
Go to either link and enter the KB number of the updates that are not
installing.
Example: If KB 123456 is not installing with the 646 error, then enter
KB123456 in the Search field of either site. Download, save, Logged-in as
the Administrator and execute locally.
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Peter
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