Win7 The sound icon and power icon in the lower right corner suddenly disappeared. How to do

Just boot and find the sound in the lower right corner. The two power icons are gone. Go to Custom and set it to “ Display icons and notifications. Turn on “turn on or off the system icon” inside the volume and power supply turned gray off

Help how to call these two again?

(1) by combination Key < ctrl + alt + del & rdquo; open & ldquo; task manager & rdquo;;

(2) in the "task manager" end the explorer.exe process;

(3 In the "Task Manager" click on the "File" in the image below. "

<4> (4) Click "New Task" in the "Files" dialog box to open the following dialog box, create a new Explorer.exe process, click OK;