Fixing the .NET Framework 3.5 Installation Error Code 0x800F0906

Addressing the error code 0x800F0906 during .NET Framework 3.5 installation can be managed through various approaches. Here are some practical solutions:

1. Utilize the DISM command: Launch Command Prompt with administrative rights and input the following command: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:E:\sources\sxs (substitute E:\ for your actual Windows installation media drive letter). This command activates the .NET Framework 3.5 feature, drawing from the installation media as its source.
2. Employ the Windows Update Troubleshooter: Navigate to Settings > Update & Security > Troubleshoot > Additional troubleshooters > Windows Update > Run the troubleshooter. This tool identifies and remedies any complications with Windows Update that might hinder the .NET Framework 3.5 installation.
3. Activate .NET Framework 3.5 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 > Click OK. This action triggers the installation of .NET Framework 3.5 from the Windows installation resources.
4. Download the .NET Framework Repair Tool: Acquire and execute the .NET Framework Repair Tool from Microsoft’s official site. This utility detects and resolves problems associated with .NET Framework installations.
5. Examine antivirus or firewall settings: Certain antivirus or firewall setups might obstruct the installation of .NET Framework 3.5. Consider deactivating or temporarily uninstalling any such applications and attempt the installation once more.
6. Initiate a clean boot: Performing a clean boot may assist in pinpointing and solving software conflicts that could block the .NET Framework 3.5 installation.