ShareMouse is removed from the computer just like any other regular program:

Windows only: If the Uninstaller informs the user that ShareMouse is still running while there is no ShareMouse tray icon, press CTRL+SHIFT+ESC to open the task manager, switch to the tab "Processes", click "Show processes from all users", highlight all ShareMouse related items end those processes by clicking on the 'End Process' button.