Can't play MP4 files

Today after i downloaded some MP4 files at first it was telling me so and so mp4 file is not a valid win32 application after uninstalling and reinstalling quicktime now when I try to play the file only like a quarter of the quicktime window even shows and it plays like 3 seconds of the audio without showing any video and says quicktime has stopped working and then the close program dialogue box shows up I have the latest version of quicktime installed. Does anyone have a solution?

Slapping myself w/a wet noodle across both cheeks!
Was so busy checking out the actual video & its codes I missed the other video download options in the left corner. Sowwy!!!!!
I downloaded the 64Kb MPEG4 (105 MB) & the 256Kb MPEG4 (169 MB) videos. Repaired permissions after the download.
At first the 256kb refused to open. Got some funny error message. So I played the 64kb video-----no problem. Got sound & video coloration was pretty good. No green discoloration.
Went back & tried the 256kb video again & this time it opened up w/o any problems. The video had both sound & picture. Same as above.
Played around w/the FF buttons on both videos & no problems with that either. QT did not crash.
"plays sound but video is green."
To be quite honest, I have no idea what would cause a dicoloration like that in QT.
See if repairing permissions & restarting helps. If not, trash QT preference & restart.
Home>Library>Preferences
Trash the com.apple.quicktimeplayer.plist file. A new one will be recreated on you open QT.

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