GWX Control Panel (previously named GWX Stopper) is a free app, which allows you to configure and exit the “Get Windows 10” system tray app which continually pops up on PCs that are still running Microsofts’s previous operating systems, Windows 7 and Windows 8.
GWX Control Panel is lightweight, has a tiny footprint and is perfectly safe and easy to use. It gives you the option to re-enable the icon and upgrade notifications if you ever feel the need to move onto Windows 10.