Fixing Error Code 0x800F0906: Installing .NET Framework 3.5 Successfully

Addressing the error code 0x800F0906 during the installation of .NET Framework 3.5 involves several effective strategies:

1. Utilize DISM command: Launch Command Prompt with administrative privileges and execute: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (substitute D:\ with your Windows installation media’s drive letter). This command activates the .NET Framework 3.5 feature directly from your installation media.
2. Deploy Windows Update Troubleshooter: Navigate to Settings > Update & Security > Troubleshoot > Additional troubleshooters > Windows Update, and run the troubleshooter to identify and rectify any Windows Update problems hindering the .NET Framework 3.5 installation.
3. Install via Programs and Features: Access Control Panel > Programs and Features > Turn Windows features on or off, select the .NET Framework 3.5 (includes .NET 2.0 and 3.0) checkbox, and confirm with OK to initiate the installation from Windows system files.
4. Run the .NET Framework Repair Tool: Download and execute the .NET Framework Repair Tool from the official Microsoft website to diagnose and repair issues related to .NET Framework setups.
5. Verify antivirus and firewall settings: Occasionally, antivirus or firewall settings may obstruct the installation of .NET Framework 3.5. Consider disabling these utilities temporarily and attempt the installation again.
6. Attempt a clean boot: Performing a clean boot might help pinpoint and solve conflicts that are obstructing the .NET Framework 3.5 installation.