Effective Methods to Fix Error 0x800f0928 When Installing .NET Framework 3.5 on Windows Server 2012

Address error code 0x800f0928 effectively to ensure the .NET Framework 3.5 installs correctly on Windows Server 2012 with these steps:

1. Verify installation of .NET Framework 3.5: Access Server Manager, navigate to 'Add Roles and Features' wizard, and confirm if .NET Framework 3.5 is installed. If present, consider a repair.
2. Implement DISM command: Open Command Prompt with administrative privileges and execute: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (adjust 'D:' to match your media drive).
3. Check for related updates: Navigate to Windows Update settings, check for and install any .NET Framework-related updates, then attempt the .NET Framework 3.5 installation again.
4. Adjust Group Policy settings: If your server is in a domain, ensure that the Group Policy settings for .NET Framework installation are appropriately configured, specifically the policies for optional component installation and direct download from Windows Update.
5. Disable antivirus interference: Temporarily disable antivirus software to eliminate any conflicts during the .NET Framework installation process.
6. Ensure Windows Installer service is active: Verify that the Windows Installer service is running via the Services console. Start the service if it is not active and proceed with the installation.
7. Scan and repair system files: Use the System File Checker tool by running 'sfc /scannow' in an administrative Command Prompt to repair any corrupted system files that might impede the installation.