The following are some things you can try if you're having problems with the Start menu or Cortana. First, check for updates:
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Press Windows logo key + R, type ms-settings:, and then select OK. This opens Settings.
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In Settings, choose Update & security > WindowsUpdate, and then select Check for updates. Install any available updates and restart your PC if required
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If you didn’t have any updates that required a restart, it’s still a good idea to restart your device to make sure any pending updates are installed.
See Troubleshoot problems with the Start menu or Cortana for more info
Check for updates