Effective Resolution of Error 0x800f0929: Installing .NET Framework 3.5 on Windows Server 2012

Address the error code 0x800f0929 to successfully install .NET Framework 3.5 on Windows Server 2012 by following these steps:

1. Verify .NET Framework 3.5 status: Navigate to Control Panel > Programs and Features > Turn Windows features on or off to check if .NET Framework 3.5 is pre-installed and consider repairing if necessary.
2. Apply the DISM command: Launch Command Prompt with administrative rights and enter: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (replace 'D:' with the actual drive letter of your Windows Server 2012 installation media). This command facilitates the installation of .NET Framework 3.5 directly from your media.
3. Engage the Windows Update Troubleshooter: Access Control Panel > Troubleshooting > System and Security > Fix problems with Windows Update and adhere to the prompts to resolve any update issues.
4. Manually install .NET Framework 3.5: Visit the Microsoft Download Center, download the .NET Framework 3.5 installer, and proceed with the installation instructions provided.
5. Check for system updates: Go to Control Panel > Windows Update, search for and install any updates particularly relevant to .NET Framework or Windows Server 2012.