Can't play .mp4 files anymore

This has nothing to do with an iphone, and ipod or an ipad. My Macbook Pro running Lion 10.7.2 will not open or play .mp4 files any longer.
I've tried opening it in quickview and it shows up as a black screen that never plays.
It does the same when i open it with Quicktime X.
If i try opening with Quicktime Pro 7, it says 'The movie contains some invalid data' 'The movie could not be opened'.
someone please help me, i don't know what's going on, and i'm a video editor, so i need to be able to work with these files like i have been for the last few years

i can dropbox it to you. it's about 107MB
and i don't restart the computer. i shut it down completely and i've tried pressing down Command R and the power button all at once and holding Command R down after letting go of the power button
i've also tried holding down command and r and while they are pressed down, then i press the power button.
none of these tedious combinations have worked.
what's your email and i can send you the file once i have it up on drop box.

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