Start Menu cant be open in Windows 10 problem.
Reason : This happens because wrong installation of system files.
Please see the below steps for solution
Step 1 : Open Run or shortcut by pressing Win+R
Step 2 : Type “sfc /scannow” and then Enter key.
Step 3 :A blank command prompt displaying and closing automatically.
Step 4 :Restart the PC.
Other Solution
Step 1 : Open “cmd”, and right-click and choose ‘Run as administrator’.
Step 2 : Type “Dism /Online /Cleanup-Image /RestoreHealth” and press OK.
Step 3 : Restart the PC \ Laptop after the scan completed.