Can't install "2020-09 Cumulative Update for Windows 10 Version 1903 (& 1909) for x64-based Systems (KB4574727)"

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EnglishmanInJapan

Hello,


I'm having trouble installing the following update.


2020-09 Cumulative Update for Windows 10 Version 1909 for x64-based Systems (KB4574727)


Windows update downloaded the 1903 version of this update, and failed, so I went to the catalog.update.microsoft.com site, and downloaded the 1909 version for this update. However it too failed to install.


Event viewer's Setup log shows the following error:


Windows update "Update for Windows (KB4574727)" could not be installed because of error 2147943005 "The specified buffer contains ill-formed data." (Command line: ""C:\WINDOWS\system32\wusa.exe" "C:\Users\Administrator\Downloads\windows10.0-kb4574727-x64_3874e5f283185dab47b6564674946a5122d4a05c.msu" ")


System Log shows:


Installation Failure: Windows failed to install the following update with error 0x8007025D: Update for Windows (KB4574727).



Now worryingly, if I select the "Details" tab - the whole Event Viewer disappears....


I've scanned my system using "Avast" (which has the latest updates) - no issues reported.


I also tried reinstalling the update with "Avast" disabled. Exactly the same errors, and exactly the same crash of Event Viewer when trying to view the details of each error.


I think there's two log files within: C:\Windows\Logs\DPX

that may contain some further details, however I can't open them (file in use) so will try to access from a Safe Mode Commandline prompt.


Any thoughts as to what's going on ?


The PC is old - basic specs:


Motherboard: ASRock G41C-GS with Intel Core 2 Extreme Q6850 and 8GB DDR3 RAM and 64 GB Free disk space on the C drive partition, and NVIDIA GeForce 9800 GT graphics card.

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