Code 800B0100- Windows Update encountered an unknown error.

Hi, I have 5 important updates that consistently fail to install due to the above error code. They are:


Cumulative Security Update for Internet Explorer 8 for Windows 7 for x64-based Systems (KB2482017)

Security Update for Windows 7 for x64-based Systems (KB2425227)

Security Update for Windows 7 for x64-based Systems (KB2479628)

Update for Windows 7 for x64-based Systems (KB2467023)

Update for Windows 7 for x64-based Systems (KB2487426)

 

I have tried the fixit tool to automatically detect problems but it does not find anything. I have also tried the system update readiness tool and it does not fix the problem as well.

http://support.microsoft.com/kb/947821

 

Question Info


Last updated April 27, 2019 Views 10,408 Applies to:
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Answer

Hi Azeworai,

The error code suggests a corrupted download of the updates. Can you try deleting the contents of C:\Windows\SoftwareDistribution\Download? This should be safe. And then try to download and install the updates again.

Mark [MSFT]

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