Quickest fix: Windows - Taskbar Has Disappeared from the Desktop

  1. Press Alt + Ctrl + Del => choose Task Manager
  2. find the Windows explorer process,
  3. Restart it.

PS: If you use a remote desktop, Press Alt + Ctrl + End instead. It's actually not a fix; it's only a workaround. Anyway, we cannot expect there to be a perfect fix for that. Microsft just sucks.