Software⏱️ 3 min read📅 2026-06-15

How to Fix 0x800f080c Error – Installing .Net Framework Error: 0x800f080c Feature name netfx3 is unknown

Error 0x800f080c occurs when trying to install .Net Framework 3.5, resulting in unknown feature name netfx3.

Quick Answer: Try using the DISM tool to repair the image and enable the correct feature name, or contact the application publisher for instructions on obtaining the appropriate version of the .NET Framework.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

The .Net Framework 3.5 Installer error 'Feature name netfx3 is unknown' occurs when attempting to install or enable .Net framework on Windows 10, causing issues with applications that rely on it.

This frustrating error affects users who need .Net framework for their applications, such as Paint.NET, Discord, UDK, UE4, and Windows Troubleshooter, resulting in failed installations and system instability.

🛑 Root Causes of the Error

  • The primary reason for this error is the lack of 'netfx3' feature in Windows 10, which was removed in version 1903. This feature name was previously used to install .Net framework 3.5.
  • An alternative reason could be a corrupted or incomplete DISM (Deployment Image Servicing and Management) tool cache, which may prevent the installation of .Net framework.

✅ Best Solutions to Fix It

Enable .Net Framework 3.5 using DISM

  1. Step 1: Open Command Prompt as Administrator and navigate to C:\WINDOWS\System32.
  2. Step 2: Run the command: `dism /online /cleanup-image /restorehealth` to scan for corrupted system files and restore a healthy state of the image.
  3. Step 3: After running the above command, run another command: `dism /online /enable-feature /featurename:NetFX3 /all /limitaccess` to enable .Net framework 3.5.

Install .Net Framework using Server Manager

  1. Step 1: Open Server Manager and navigate to the 'Add Roles and Features' wizard.
  2. Step 2: Select 'Remote Access' and click 'Next'. Then, select '.NET Framework 3.5 (Feature)' and click 'Next'.

🎯 Final Words

By following these steps, you should be able to resolve the .Net framework installation error and enable .Net framework 3.5 on your Windows 10 system. If issues persist, consider seeking further assistance or contacting Microsoft support.

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