Yesterday I updated my iMac's software using the Software Update and ever since then a message appears on the desktop that says... "Searching for movie file "filename"... It gives me the option to press "Stop" but I cannot stop it. Shortly after this message a second message appears that says... "The movie file "filename" cannot be found. Without this file, the movie cannot be played properly." It gives me the option to click "Cancel" or "Search" but I cannot click on it at all. I searched the problem online, and it says that it has something to do with iTunes, but the file isn't even in iTunes. Ideas?