Fixing Error 0x800f0926: Installing .NET Framework 3.5 on Windows Server 2012

Follow these effective methods to address the error code 0x800f0926 during the installation of .NET Framework 3.5 on Windows Server 2012:

1. Verify .NET Framework 3.5 installation status: Navigate to Control Panel > Programs and Features > Turn Windows features on or off. Check whether .NET Framework 3.5 is already activated.
2. Apply the DISM tool: Launch Command Prompt with admin rights and input: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (substitute D:\ with your Windows Server 2012 media drive letter). This action triggers the installation of .NET Framework 3.5 directly from your media.
3. Run the Windows Update Troubleshooter: Access Control Panel > Troubleshooting > System and Security > Resolve Windows Update problems. Execute the prompts to diagnose and resolve any complications with Windows Update.
4. Manually install .NET Framework 3.5: Visit the Microsoft Download Center, download the .NET Framework 3.5 installer, and proceed with the guided installation by following the prompts on your screen.
5. Inspect and repair system files: Open Command Prompt as administrator and execute: sfc /scannow. This will scrutinize your system files for any damages and perform necessary repairs.