This is called the Sidebar.
Select the Windows circle in the bottom left of your desktop and your main Windows menu appears.
In the "start search" area at the bottom type "sidebar" and the menu should list "sidebar" and "sidebar properties"
Select "Sidebar properties" and the Sidebar Properties window should appear.
Select the option "Start sidebar when Windows starts" and press OK
Reboot your computer and the sidebar should reappear and always start up when Windows starts.