Quicktime Player Pro won't play any movies?

Ever since I restored my computer about a month ago, my Quicktime Player won't play any video formats correctly. .avi files don't play anymore, and mp4 files only play sound with the screen black. Then when I try to close the application, I get the pinwheel for a long time, thus making me force quit every time. How can I fix this so it can play movies correctly?
(I'd also like to know how to get it to play .mka format movies as well)

Courtney,
There are a lot of possible CODECS used with .AVI file, not all of which are available for the QuickTime player.
If you just want to play the AVI files use the free VLC media player found at http://www.videolan.org/vlc/

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Quicktime Player Pro won't play any movies?

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