Windows 10: March 20H2 update, endless problems

All problems started after running Windows Update on 3.10.2021 ~5GB downloaded. The 1st symptom was that the Cryptographic Service often ties up my 1TB HDD for long periods.

Lenovo x64 laptop, AMD Ryzen 5 purchased November 2020, with Win10 1909? pre-installed. I did no previous multi-gigabyte update, until on 3.10.2021 when it became mandatory.

I cannot install any more updates, either via Windows Update or manually from the catalog.
MS Update Troubleshooter msdt.exe says: error 0x800705B4

If I try any update, it goes through the whole process, then reports that it failed. E.g., trying KB4577586 manually from the catalog, looks all normal until the very end with: "not installed". Or trying via Windows Update does the same thing.

I have done many many reboots.

sfc /scannow
"Windows Resource Protection found corrupt files but was unable to fix some of them."
sfc will often hang before exiting, until I manually end the Cryptographic Service by using Task Manager

I just tried again with a single bad file described in CBS.log as: hashes don't match, and both files are corrupted
C:\WINDOWS\system32>sfc /SCANFILE=C:\Windows\System32\eqossnap.dll
"Windows Resource Protection found corrupt files but was unable to fix some of them."

Running sfc in Safe Mode made no difference.

DISM says "...is repairable"
but then C:\WINDOWS\system32>DISM.exe /Online /Cleanup-image /Restorehealth
says: The source files could not be found.

Note that DISM says "Image Version: 10.0.19041.1" which AFAIK is Windows 2004,
even though on 3-10-2021 I was forced to upgrade to 10H2

Both winver and Settings/System/About each say I have Version 2004. But in Settings/Update/View Update History it says: Feature Update to 20H2 ... successfully installed 3.10.2021

under "Uninstall an update", I have listed only these two:
KB4562830 enable 20H2
KB4598481 security update


chkdsk said it fixed some files, but there is no improvement. But the contents of CBS.log changed somewhat.

CBS.log says that these are bad:
cmi2migxml.dll
mobsync.exe
netcorehc.dll
eqossnap.dll
netcorehc.dll
WSDPrintProxy.DLL but I never use any printer
WWanHC.dll
PNPXAssoc.dll

Can I manually fix/replace them? I do not have another, healthy PC with Win10 to get replacements from. Why can't I simply get individual replacements from Microsoft online?


In exasperation, I tried to Cloud Reset to 2004. I got "There was a problem downloading. Unable to download. Please try Reset this PC using the local reinstall option."
https://windowsreport.com/reset-your-pc-using-cloud-download/

But what I REALLY REALLY REALLY want is to fix this without losing all my files and data. I have plenty of HDD space. But I don't want to spend half a day on my slow connection downloading 5GB for a repair-install, only to have that fail. E.g.: https://www.tenforums.com/tutorials/16397-repair-install-windows-10-place-upgrade.html
"If you have Windows 10 version 20H2 installed, then it is required to have KB4586853 for build 19042.662 or higher installed to be able to do a repair install and keep everything."


I have set the time period for going back to my previous Win10 version 1909? from 10 days to 60 days. I also have just now renamed my Windows.old file to Windows.old.ren so that it shouldn't be auto deleted. I have also paused Windows Update to the maximum, as all it ever does anymore is go through the download and install, then report "Failed".

Possible complicating factors: I have installed Android Studio, which set up a virtual phone via virtualization. I also run FortiClient AV and so I have in my list of possible internet connections FortiSSL but my antivirus installation is only for me as a individual, I am not part of any network. Could either of those have changed my "bad" DLLs?

I ran sfc and DISM with FortiClient AV disabled and Win Defender enabled, but that made no difference.

I made a USB restore disk, but only after the 3.10.2021 problems.

The only System Restore point I have listed is for 3.14.2021, which is after the 3.10.2021 beginning of all the problems.

Is my only option to Restore back to my previous major version 1909?, and then have to spend another half day upgrading to 20H2 again, only to possibly have all the problems repeat?


Thanks for any help.




:)

 

windows 10 updates-March 2018

I have March updates that will not install. The automatic updates for 2018-03 Cumulative Update for Windows 10 version 1709 for x64 based system (March KB4088776) were activated and downloaded to my computer, but they will not install on shutdown/restart.
When I check for updates, it shows that the updates are downloaded, but when I click to uninstall, there is not a date for installation. I have researched the Windows suggestions for this problem. They tell me to remove the January 2018 updates (January
KB4056892) and then reinstall the March update. When I attempted to uninstall the January update, I could see the update listed in the check for downloads screen, but when I click uninstall, the January update has a different reference number. Please advise.
I have talked to my technology department and they can't determine next steps either. VERY FRUSTRATING. I need my computer for work.

 

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Update 20h2

Hi Wicki,

I am Sumit, an Independent Advisor and a 3 year Windows Insider MVP here to help.

20H2 should not be installed right-away on your device - MS said the rollout is only to a fraction of users and would be labeled as an optional update initially. Are you enrolled in WIP?

You may uninstall 20H2 using the steps below:

https://www.yourwindowsguide.com/2020/10/uninst...

Content on the above blog is written by a Microsoft MVP so it is safe. However, do watch out for the ads.