Quicktime x won't play movies

I have snow leopard, mac os 10.6.2 and quicktime x. Ever since I upgraded to snow leopard whenever I put movies into my mac they won't play. They use to automatically play but now they don't. I can't manually make them play either. When I open quicktime it won't even recognize a movie is in. When the movie pops up on the desktop and I open it, it opens as the audio and video file folders and not the actual movie. Any help?

Ever since I upgraded to snow leopard whenever I put movies into my mac they won't play. They use to automatically play but now they don't. I can't manually make them play either. When I open quicktime it won't even recognize a movie is in. When the movie pops up on the desktop and I open it, it opens as the audio and video file folders and not the actual movie. Any help?
Are these movies employing legacy codecs and/or require a third-party component package like Perian? If so, have you updated the needed components that will work under the QT X/7 combined structure/QTkit?

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