In the command prompt, type sfc /scannow and hit Enter. Choose Command Prompt (Admin) from the context menu. Press Windows key and X at the same time. How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows 8. In this article, I’m going show both ways “How to show or hide Mac OS X El Capitan Menu Bar” and as well as ” How to hide or show Taskbar on Windows”. The menu bar is functioning as taskbar on Windows OS. As you can hide or show the Windows operating system “Taskbar”, you can hide or show the menu bar on Mac OS X El Capitan as well.