Troubleshooting Error Code 0x800f0926: Issues Installing .NET Framework 3.5 on Windows Server 2012

Undertake these actions to resolve the error code 0x800f0926 during the installation of .NET Framework 3.5 on Windows Server 2012:

1. Verify existing installation: Navigate to Control Panel > Programs and Features > Turn Windows features on or off to check whether .NET Framework 3.5 is already installed.
2. Employ the DISM command: Execute the following in Command Prompt with administrator rights: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (alter D:\ to the appropriate drive letter of your Windows Server 2012 installation media). This will install .NET Framework 3.5 directly from the media.
3. Utilize the Windows Update Troubleshooter: Access Control Panel > Troubleshooting > System and Security > Fix problems with Windows Update and follow the prompts to address update-related issues.
4. Manually install .NET Framework 3.5: Visit the Microsoft Download Center, download the .NET Framework 3.5 setup, and follow the installation instructions provided.
5. Scan for corrupted system files: Launch Command Prompt as an administrator and input: sfc /scannow to check and repair corrupted system files.