Quick time 'this is not a movie file' error message

PLEASE HELP!
i've recently downloaded some movies off the internet (.avi files) and although all have originally opened and played in quicktime, i am now getting 'this is not a movie file' error messages for all of them. I've had this before and restarting the computer has usually helped - but not this time. I've also tried reinstalling quicktime, as well as installing divx (i get an error message saying this file cannot be opened). for some reason i can't install VLC (some message about not being able to mount).
I've also burnt the files to a cd and tried playing from there (Rather than my external hard drive) but still won't work. The files won't even open up a preview... i really don't understand what could have happened though - i've opened and played all of them when i first downloaded them and they worked just fine!
i'd appreciate any help.
cheers

The fact that you cannot even mount one file or install another makes it sound more like an OS problem than a QT problem, though I guess in part some people deserve what they get with pirated movies through torrents. Have you repaired permissions?
The files you cannot even use that are not the videos in question indicate your problems lie elsewhere.

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