1. Hold down the 'Windows' key and 'R' to open Run. Type 'cmd' or 'cmd.exe' into the dialog box. Press 'OK' to open Command Prompt.
2. Enter 'taskkill /f /im explorer.exe' into Command Prompt. Press 'Enter' to terminate the running process.
3. Type 'explorer.exe' into Command Prompt. Press 'Enter.' Command Prompt will restart Windows Explorer.