Fixing Error 0x800F0950 When Installing .NET Framework on Windows

Error 0x800F0950 commonly appears when you try to install .NET Framework 3.5 or 4.8 on Windows 10 or 11. The issue may stem from network problems, corrupted system files, or update conflicts. Below are several methods you can use to troubleshoot and resolve this error.

1. Use the Windows Features Installer

The easiest way to install .NET Framework is through the "Turn Windows features on or off" utility. Here’s what you need to do:

  • Go to the "Control Panel" and click on "Programs."
  • Select "Turn Windows features on or off."
  • Locate .NET Framework 3.5 (includes .NET 2.0 and 3.0) and check the box.
  • Click "OK," then "Apply" to start the installation process.

2. Install .NET Framework via Command Prompt

If the above method fails, you can use Command Prompt with administrator privileges to manually install .NET Framework:

  • Press Win + X and choose "Command Prompt (Admin)."
  • Enter the following command and press Enter: 
    dism /online /enable-feature /featurename:NetFx3 /All /Source:X:\sources\sxs /LimitAccess
  • Replace X: with the drive letter of your Windows installation media.

3. Update Your Windows System

Sometimes, the error can be caused by missing updates. To ensure your system is up to date:

  • Open "Settings" and navigate to "Update & Security."
  • Click "Check for updates" and install any pending updates.

4. Use Windows Installation Media

If you still encounter error 0x800F0950, try using the installation media for .NET Framework activation:

  • Insert a USB drive or DVD with the Windows installation files.
  • Launch Command Prompt as an administrator.
  • Run the following command, replacing X: with your installation media’s drive letter: 
    dism /online /enable-feature /featurename:NetFx3 /All /Source:X:\sources\sxs /LimitAccess

5. Run System File Checker (SFC)

Error 0x800F0950 might be caused by corrupted system files. To check and repair these files, use the SFC tool:

  • Open Command Prompt as an administrator.
  • Type sfc /scannow and hit Enter.
  • Wait for the scan to finish, then restart your computer.

If the error persists after trying all the above methods, consider reinstalling your Windows operating system or reaching out to Microsoft support for further help.