Quick Time file not opening

Suddenly QuickTime 7.5.5 stopped opening the movies stored in one Hard Disc.
Here are descriptions of how problem occurs:
1) The preview in finder +column view+ shows only blank space, but not a movie.
2) Instead of opening the file QT claims that "This is not a movie file"
3) Not all the movies in the disk are injured but about 80 % of them. There might be in same folder movies that behaves normally and movies that behaves as described above.
I have restarted the machine few times and repaired the disk with disk utility, with not any couraging results...
If there were any ideas what the problem might be, and how to fix it, advices would be very much appreciated.
Screenshots of the problem:
http://koti.welho.com/tsuonio1/File-not-open.jpg

Two possibilities spring to mind. One is that the HD itself has been damaged somehow. Try copying one of the "bad" video files to your boot drive and opening from there. If it won't copy, your HD is clearly bad, if it copies and plays then something weirder is going on with the drive.
The other possibility has to do with the h264 codec you used. Apple's implementation of the H264 standard is a work in progress, they've been gradually adding features that are part of the full standard and may have broken something. If you recently upgraded QT that may be the problem. If you created the files using a third party H264 codec that might explain the playback problems. Also, you should install Perian (www.perian.org) and see if that helps, their codec plays back many formats that Apple doesn't support out of the box.
You may need to upload one of the bad files to an filesharing website of some kind so that other folks here can download and look at it themselves.

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