If you use your internet through a wi-fi, you would probably see this icon of two computers with a red cross on them, in your system tray. If you bring your cursor on it, you would see that it reads, "Local Area Connection. A network cable is unplugged". Now this is one icon which is not required in your system tray and you can safely remove it from there. To do so, "right click" on those 2 computers icon and select "open network connections" On doing so your "Network Connection" window would open. There right click on "Local Area Connection" and click on "Disable" Close your Network Connection window and there, the icon from your system tray goes off!