Windows start menu doesnt work

hello it seems your version of windows is not up to date , update it with this link : Windows 10 clicking "Update now"

using it and testing it on a virtual machine doesn't cause problems

you can repair windows with tweaking.com too , it makes come back everything

http://www.tweaking.com/content/page/windows_repair_all_in_one.html

Install , click on the tab Start Repairs => Repairs => Open Repairs and check "all Repairs"

close all applications and click on "Start" 

let the tool work 'till the end and after that , restart the computer