Windows Update is taking an unusually long time to scan and install updates
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Symptoms
Consider the following scenario:•You do a clean installation of Windows 7 or you have not checked for updates for a long time.
•You try to install updates for Windows 7 from Windows Update.
In this scenario, you may experience a long delay identifying and retrieving updates from the Windows Update service.
Cause
This issue occurs because the latest updates for the Windows Update service aren't installed.