There appears to be an issue in Windows 10 with the Start Menu, Action Center, Search Bar not opening and/or working for some users on some computers. Other users on the same computer are fine …. People are claiming this is a user profile or system file corruption and are suggesting an image restore process which first became available in Windows 8.

Anyway – Here are the suggested solution(s):

Several links —

http://www.urtech.ca/2015/09/solved-fix-windows-10-start-button-does-nothing-in-10-minutes/

http://home.bt.com/tech-gadgets/computing/has-your-windows-10-start-menu-stopped-working-here-are-four-ways-to-fix-it-11364000314532

https://social.technet.microsoft.com/Forums/en-US/4cfabb10-f1c3-487e-bf75-2749167d72a5/windows-10-search-box-not-responding?forum=WinPreview2014Feedback

http://www.windowsalle.com/windows-10-how-to-fix-the-start-menu-flyout-menus-and-action-center-not-opening/