So your taskbar disappears and soon you realize you've lost "explorer.exe." Press and hold three keys, Ctrl + Alt + Delete, to run Task Manager. Go to "File" and select "New Task (Run...)" and enter "explorer.exe" in the new "Open" box. Click "OK" and explorer should resume just as you left it.
What to do when Explorer.exe dies
So your taskbar disappears and soon you realize you've lost "explorer.exe." Press and hold three keys, Ctrl + Alt + Delete, to run Task Manager. Go to "File" and select "New Task (Run...)" and enter "explorer.exe" in the new "Open" box. Click "OK" and explorer should resume just as you left it.