A month ago I viewed a video clip from the bbc news media in uk. Now when I press the dashboard button on the mouse, the quicktime menu appears and the video clip plays in the background. I don't find any way to delete it. When I select the delete, a window asks me to buy the pro system of quicktime. There must be a way to get rid of this. I have a imac 10.5.2. Any help will be appreciated.