Windows 10: Windows 10 Update error. 2021-11 Cumulative Update Preview for .NET Framework 3.5 and 4.8...

I have already tried to do SFC and DISM fixes. I even tried running the Windows Update troubleshooter. I have attached a link to the Windows Update log so that some experts can check and see what is causing the problems with Windows Update. I have had problems since August 2021 and I have not been able to update my OS. Windows Update LogMy System Information:OS Name Microsoft Windows 10 Home Single Language Version 10.0.19042 Build 19042 Other OS Description Not Available OS Manufacturer Microsoft Corporation System Name SYSTEM32 System Manufacturer LENOVO System Model 80WK System Type x64-ba

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KB4586876 Cumulative Update .NET Framework 3.5, 4.8 Windows 10 Jan. 12 Win Update

Hi Denis:
Thank you for your detailed instructions!! This will probably take several days & I'll keep you updated.

I did steps 1 & 2. This installed more updates than I could count...something like 20-30. However, KB4586876 was not listed. Unfortunately, I had to undo several things (I now remember why I didn't update all MS products). I have Word, Excel, & Access from 2003, as well as Word & Access 2016. Updating MS products caused a "file validation" problem whenver I opened a .doc file. I fixed that (with a registry hack). However, it did something to Word 2016, where all my .doc & .docx files were opened by Word 2003 & Word 2016 wasn't an option under "Open with...". I ended up restoring everything from Macrium Reflect.

I will now start with step 3.2.

- - - Updated - - -

Thank you. After checking again, my settings are the same as yours. Also, As Denis pointed out, I had looked at the wrong key. I checked the registry at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full & found it to be the same as yours.

Hi @Try3 & @Ghut:

I tried to install the runtime from Ghut post #22 (Denis: your Step 4.2) & it said that I already had the latest versions installed. I then tried to reinstall .Net Framework & went to the catalog:
PHP Code: 2021-01 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 2004 for x64 (KB4586876)
Last Modified: 1/8/2021
but I couldn't download it. Basically, nothing happened & I got this image:



I tried Step 5.2 in post #26, but I show both 3.5 & 4.8 installed.

I guess I'll try Step 6.2 now...turning off .NET Framework 3.5 &4.8 & turning them back on. Before I do, do I need to reboot in between. I don't want to screw this up.

Thanks again to both of you!!

 

KB4534132 Cumulative Update .NET Framework 3.5, 4.8 Windows 10 Feb. 11 Win Update

 

KB5003537 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10 Win Update

This was installed yesterday together with KB5003690 also preview




Have to RTFineM for editing posts