The orthodox way:
Step 1: Download and install the Windows Update agent
For more information about how to download and install the latest Windows Update agent, click the following article number to view the article in the Microsoft Knowledge Base:
Step 2: Reset Windows Update components
The unorthodox way:
Step 1: Press the Windows key + R
Step 2: You will open a run command and in the run command, you type regedit
Step 3: Once you open the registry editor, you will see a bunch of keys, simply navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU
Step 4: Remove the key. Restart and the update should work.
WARNING: Before you do this step, it is mandatory to back up your registry if something goes wrong.
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