Fixing .NET Framework 3.5 Installation Error 0x800F0906

Resolve the error code 0x800F0906 when attempting to install .NET Framework 3.5 with these strategies:

1. Deploy the DISM command: Launch the Command Prompt as an administrator and input: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (substitute D:\ with your Windows media drive letter). This will activate .NET Framework 3.5 using your installation media as the source.
2. Run the Windows Update Troubleshooter: Navigate to Settings > Update & Security > Troubleshoot > Additional troubleshooters > Windows Update and execute the troubleshooter to identify and resolve any Windows Update problems hindering .NET Framework 3.5 installation.
3. Activate from Programs and Features: Access Control Panel > Programs and Features > Turn Windows features on or off, select the box next to .NET Framework 3.5 (includes .NET 2.0 and 3.0), and click OK to install it from Windows installation files.
4. Utilize the .NET Framework Repair Tool: Download and execute the .NET Framework Repair Tool from Microsoft's official website to address and resolve installation issues.
5. Inspect antivirus or firewall interference: Certain antivirus or firewall settings might prevent the installation of .NET Framework 3.5. Consider deactivating or temporarily uninstalling such software and attempt the installation again.
6. Conduct a clean boot: Performing a clean boot may help identify and solve software conflicts that are obstructing the installation of .NET Framework 3.5.