The specified error indicates that your browser is not properly configured to run custom actions. Please follow the instructions in our knowledge base in order to properly configure your particular browser. We support Internet Explorer, Firefox and Chrome. Firefox and Chrome require a plugin to be installed.
Internet Explorer: http://lansweeper.com/kb/customactions.aspx
Firefox: http://lansweeper.com/kb/firefoxplugin.aspx
Chrome: http://lansweeper.com/kb/custom-actions-in-chrome.aspx