I saw a question on a software development board about how to restart Windows Explorer. This is one that I actually know the answer to. First you need to bring up the Windows Task Manager. Then you must kill the "explorer.exe" process. When it is killed, you choose File New Task from the Windows Task Mangager menu. And you type in "explorer.exe" in the open dialog. It will take a little while for Explorer to restart and show the desktop, task bar, and start menu. But this comes in handy when things go awry with Windows Explorer.
The new thing I recently learned about Explorer is that there are a number of optional command line options for the program. For example, "/n" will
[Open] a new single-pane window for the default selection. This is usually the root of the drive Windows is installed on. If the window is already open, a duplicate opens.