FIX: Microsoft.Windows.ShellExperienceHost & Microsoft.Windows.Cortana applications need to be installed correctly.
If you are a Windows 10/11 user and you cannot open the Start menu or the Cortana search bar and the Windows Troubleshooter displays the error "Microsoft.Windows.ShellExperienceHost and Microsoft.Windows.Cortana applications need to be installed correctly", continue below to fix the problem.