Force Quit Macbook

Why do I get the spinning ball on the screen of my MacBook whenever I engage a multimedia recording segment?
The spinning (and extraordinarily annoying) 'the computer is thinking' ball usually pops up when I try to record video in Photo Booth or iMovie. The program seems to freeze, then I force quit the application. It's a new computer. What is your advice?
boy apple really messed up with leopard, i dont use imovie but maybe its the video formats that you are using with it
http://www.alinuxworld.com
How to Force Quit Apps in Mac OS X
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