Quicktime won't play videos

A friend of mine recently sent me a video through facebook that she recorded on Photo Booth. When I downloaded it and tried to play it, Quicktime displayed a message saying "QuickTime Player can't open 'Movie on 11-14-13 at 10.04 PM.mov'." She tried eamiling it, but I got the same message.
I've browsed through the dissusssuion boards. Lots of people suggested using VLC, but when I tried using that, nothing happened. I also tried using Quicktime 7 and nothing happened.
Quicktime will play anything I record and put on my computer, But when I receive something from someone else, it's not working.
She told me she's been having the same problems with videos I send her. Even with videos we record with out cameras (Canon T3i and T3) this is happening.
Do I need to buy some software? Do we need to change some preferences in our systems?

No, usually, like I said in the begining, I share thru facebook. It has always worked until now. And when I tried to upload the sample download, it said there was an error.
Not a "social network," DropBox, YouTube, or Vimeo user either. Since you say there is aproble viewing Google Drive content as well as FaceBook content, suggest you make a quick check to ensure files are downloading properly. Try downloading the following "test" file:
Test_H264.m4v
"Control-Click" or "Option-Click" the link above to download the file and then see if it plays in your QT X, QT 7, and/or other media player you have installed. I.e., this file should be compatible with almost any QT or QL based app even though it contains a secondary AC3 audio track. It is essentually the same compression formats as recorded by Photo Booth. So if this file plays correctly then the problem is as previously stated—either a corrupted file or improperly terminated file caused by your workflow (whether on your system by you or as part of the uploading/downloading process used).

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