How to resolve error code 0x800f0818: Feature installation failure on Windows Server 2012 R2

Follow these steps to resolve error code 0x800f0818:

1. Update your system: Ensure your Windows Server 2012 R2 has the latest updates. Navigate to Settings > Update & Security > Windows Update and click Check for updates.
2. Run the DISM tool: Launch Command Prompt as an administrator and enter the command: DISM /Online /Cleanup-Image /RestoreHealth. This will check for and repair any corrupted files.
3. Run the System File Checker tool: Open Command Prompt as an administrator and enter the command: sfc /scannow. This will detect and repair any corrupted system files.
4. Turn off antivirus software: Antivirus programs can sometimes block feature installations. Temporarily disable your antivirus software and then try to install the feature again.
5. Use the Windows Server installation media: If the previous steps don't work, try using the Windows Server installation media to install the feature. Insert the installation media, run the setup.exe file, choose the option to upgrade your current installation, and follow the prompts to complete the installation.