Troubleshooting Error Code 0x800f0928 for .NET Framework 3.5 Installation on Windows Server 2012

To address error code 0x800f0928 during the installation of .NET Framework 3.5 on Windows Server 2012, follow these troubleshooting steps:

1. Verify installation status: In Server Manager, navigate to 'Add Roles and Features' to check if .NET Framework 3.5 is already installed. If present, attempt a repair.
2. Execute DISM command: Launch Command Prompt as an administrator and input: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (substitute 'D:' with the correct drive letter of your installation media) to install from the media.
3. Utilize Windows Update: Access Windows Update settings, check for updates, and install any that pertain to the .NET Framework before trying the installation again.
4. Adjust Group Policy settings: For servers within a domain, ensure the Group Policy settings for .NET Framework installation are correct. Set 'Specify settings for optional component installation and component repair' to 'Enabled' and allow direct download from Windows Update when using WSUS.
5. Disable interfering antivirus software: Temporarily disable any antivirus software that may be blocking the installation of the .NET Framework.
6. Ensure Windows Installer service is active: Open the Services console to verify that the Windows Installer service is running. Start the service if it is not active and retry the installation.
7. Run System File Checker: Open Command Prompt as an administrator and execute: sfc /scannow to repair corrupted system files that could be causing installation issues.