Windows 10: Windows 10 and .NET 3.5

Hello, I've been trying to resolve this issue for a while and need some assistance. It appears that my home laptop is running optional features that I did not install. I have discovered ACL files not sure what they are or where they came from that seem to take over the machine after trying to do a clean install. Any way to correct this?I've tried reformatting the drive.I've bought and installed a new drive.Everything eventually leads to a blue screen and another attempt to install.I seem to end up with Microsoft .NET 3.5, Mixed Reality and other items that I either don't know what they are o

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.NET Framework 3.5 error 0x80070002 Windows 10

Hi,



Welcome to Microsoft Community.

I understand your concern. I will do my best to fix the issue.



To assist you better I would like to know, which game are you trying to play?



Let’s try simple troubleshooting steps and check if this helps in resolving the issue. I suggest you to uninstall and reinstall the
.NET Framework 3.5. Follow the below steps.

• 
  Press Windows key + X and select
  Control Panel.
  
• 
  Click on Programs and features, click on
  Turn Windows features on or off on the left pane.
  
• 
  Click on .NET Framework 3.5 on the Window pop up to expand.
  
• 
  Uncheck the box and check on Ok.
  
• To re-install it back check on the box and click on OK.

Also, I suggest you to install all the Windows update.



Hope this helps. Keep posting us with the status we will be glad to help you.

 

Unable to download any framework for .net - (error code 0x80070002)

OK, the Windows 10 Feature installation method should have been straightforward, but since that errored out as well, something else seems to be going on with your Windows, so wait for somebody with more experience to suggest a way out.

In the mean time, if you haven't already, you could give muchomurka's suggestion a go as well with the elevated prompt and an install media to see if it works. The following link shows the detailed steps involved.

Offline install of .NET Framework 3.5 in Windows 10 using DISM

 

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!!