'Start Menu and search box are not responding on click on win 10

Start menu, search option, windows defender are not responding on click. Defender gets opened and then close.

I have tried -

  1. Restarting windows explorer from task manager.
  2. Created other user profile.
  3. Checked safe mode. Same issue there
  4. Changed value of start under local machine which is under regedit.

I can't reset this pc as my work apps are installed and I don't remember my username and password to login again if I remove them. So, looking for an alternative. Even I tried signing in Microsoft account through settings, it opens and then closes. Please suggest.



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