If Windows Update mysteriously fails to install updates, it may become necessary to completely clear the Windows Update cache. This resets the state of updates, removes downloaded files and requires Windows Update to completely re-analyze your system to figure out what updates are required.
The procedure is non-invasive and can be performed on workstations and servers alike and without downtime.
net stop wuauserv
cd /d %windir% rd /s SoftwareDistribution
net start wuauserv
The cache has now been cleared and you can perform a new check for updates. It may take a while for the check to complete as Windows Update has to analyze your system from scratch.
If the above procedure did not work, you may have to completely reset Windows Update components (KB 971058).
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