End a Running Task
You can end a running task to stop the task from completing its actions. This action stops the task while the task is performing certain process. Only tasks with the If the running task does not stop when requested, force it to stop setting selected, will be forced to end if they do not stop when you try to end them.

To stop a running task from the existing task list:
Select a task in the Power Reports Task Manager. 
Click button option in Task Actions pane to stop the running task immediately.