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You download it from Microsoft (on Microsoft's troubleshooting page, click "Try the troubleshooter" and then "Start menu troubleshooter"), double-click to run it (filename “startmenu.diagcab”), and follow its prompts. The Start menu troubleshooter can detect and fix problems with files and settings related to the Start menu and Cortana. But the company also provides a Start menu troubleshooter tool that will likely be a more effective solution. To fix such issues, Microsoft’s troubleshooting suggestions range from the mundane (restart Windows 10) to the more complicated (create a new user account with administrator privileges and then sign in with it).
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The Cortana panel might not open when you click its search box (to the right of the Start button), or perhaps it won’t respond when you type into its search box or when you speak a request to it (and you know your computer’s connection to the internet is good). Windows 10’s personal digital assistant Cortana, which is built into the Start menu, can act up as well.
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