On a 'server' level (more or less permanent) open up IIS Manager, click your server and on the 'functional view tab' double-click modules. Then locate it and right-click delete. (see screenshots)
Perhaps easier in terms of undo is to open the web.config for your Sitefinity project and under <modules> add the line <remove name="LiveStreamingHandler" />. (see screenshot)
By using the web.config method, you'll still keep the LiveStreamingHandler installed on the server, but you'll just disable it for the Sitefinity project.