Open the Organizer program and go to Edit/Preferences/Auto Analysis (or Media Analysis in some versions).
Thank you, Steve! I've just graduated from iMovie 08 to Premiere Elements 10, and I thought it would be an easy transition! Now, I'm a bit overwhelmed, but I'm determined to master this application.
I will quickly "second" that Basic Training Series. It answers so many questions, and points one on the correct path to editing with PrE.
Good luck, and happy editing,