I'm not sure if this will work but right click on the taskbar and select Task Manager.
Under the Processes tab, scroll down to Windows Explorer, click on it and then on Restart.
Your taskbar will momentarily disappear and when the CPU usage returns to normal, type control panel in the search box to see if it comes up.
If it doesn't then go back into Task Manager, click on File/Run new task and type Control Panel and check the box to create task as an administrator.
That should open Control Panel where its icon will appear in the taskbar for you to right click on it and select Pin to taskbar.