How can I troubleshoot the netfx3 error if SQL Server 2014 was previously installed and is now failing after a Windows update?

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Grade: Education Subject: Support
How can I troubleshoot the netfx3 error if SQL Server 2014 was previously installed and is now failing after a Windows update?
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Windows updates can sometimes corrupt the .NET Framework installation. First, try running the .NET Framework Repair Tool. If that doesn't work, attempt to uninstall and reinstall .NET Framework 3.5. You might also need to repair the SQL Server installation itself, as it may be relying on the corrupted .NET Framework components. Check the Windows Event Logs for clues about the update's impact.