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Microsoft .NET Framework 3.5 error

Anonymous
2025-08-24T20:35:23.6933333+00:00

I am trying to install

"Microsoft .NET Framework 3.5 contains many new features building incrementally upon .NET Framework 2.0 and 3.0, and includes .NET Framework 2.0 service pack 1 and .NET Framework 3.0 service pack 1."

However I keep getting error codes: 0x80073712 & 0x8000FFFF

Screenshot 2025-08-24 151518

Screenshot 2025-08-24 162802

I was told to try these troubleshooting steps from searching up how to fix & I did use the command prompt with the provided steps it says it was succesfully repaired however I am unable to install "Microsoft .NET Framework 3.5 contains many new features building incrementally upon .NET Framework 2.0 and 3.0, and includes .NET Framework 2.0 service pack 1 and .NET Framework 3.0 service pack 1."

How to fix it (step by step):

  1. **Run System File Checker and DISM Open Command Prompt as Administrator and run: cmd sfc /scannow DISM /Online /Cleanup-Image /RestoreHealth 
    
   These repair Windows components needed for .NET.
  2. Install with Windows installation media
    • Insert your Windows installation ISO/USB.
    • Run: 
      
     DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
      (replace D: with your media drive letter).
  3. Check Windows Update service
    • Press Win + R, type services.msc.
    • Make sure Windows Update and Background Intelligent Transfer Service (BITS) are running and set to Automatic.
  4. Clear Windows Update cache
    • Stop the Windows Update service: 
      
     net stop wuauserv

     net stop bits
    • Delete contents of: C:\Windows\SoftwareDistribution\Download
    • Restart services: 
      
     net start wuauserv

     net start bits
  5. Try offline .NET 3.5 installer Download the official offline installer for .NET Framework 3.5 SP1 from Microsoft’s site and run it directly.
Windows for home | Windows 11 | Performance and system failures
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Answer accepted by question author

Lester Bernard Reyes 81,750 Reputation points Independent Advisor
2025-08-24T21:16:09.1866667+00:00

Hi, I'm Bernard, a fellow Windows user. I'm happy to help!

This is an issue with a misconfigured .Net Framework on the PC. To sort out the issue, kindly follow the steps below:

Method 1. Download and Repair using Microsoft .NET Framework Repair Tool

Kindly download and repair the Framework using this link: https://www.microsoft.com/en-us/download/details.aspx?id=30135

Once done downloading and running, try restarting the device and check.

Method 2. Uninstall and reinstall .Net Framework

Press the Windows key + R, then type in:

optionalfeatures

Then hit OK

Uncheck for .Net Framework 3.5, then follow the prompt and restart the PC.

Once the PC is booted again.

Press the Windows key + R, then type in:

optionalfeatures

Then hit OK

Click on Turn Windows Features on or off

Check for .Net Framework 3.5, then follow the prompt and restart the PC.

If none of the above solutions work, I suggest doing an in-place upgrade, wherein it will update the device to the latest version and repair all issues without deleting any files.

 

Kindly follow the steps from this link:

https://answers.microsoft.com/en-us/windows/forum/all/how-to-run-in-place-upgrade-in-windows-11/4d469147-2747-4dcb-88a4-aae9273a4500

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  1. Lester Bernard Reyes 81,750 Reputation points Independent Advisor
    2025-08-25T00:36:41.09+00:00

    You are always welcome, and I'm glad it is now all good.

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