Today on wards my start menu is not working Displaying a message Critical error How can I solve this?

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Windows Central Question

Today on wards my start menu is not working" Displaying a message Critical error"

After installing windows 10, today onwards i have this problem.When i clicked on the start menu, a pop up window displayed and a message is displaying "Critical error next time you sign in we will fix it."
There is a option for sign out also.
When i clicked on it again the same thing will repeat.
My itunes also opening with out click on ii.
Hope it will solve soon
Thank you.