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Huh?
That's the message I get when I try to open the QuickTime Player - "QuickTime Player cannot be launched because it has been damaged."
Near as I can tell, it just happened one day. Maybe after a system update? Tried reinstalling completely, didn't help.
OS X, v10.3.7, old-as-dirt G4 450 (!) MHz.
I'd try yet another system update or look for newer quicktime updates online. Maybe some other system update you pulled isn't playing nice. After that if things still no worky maybe hit the "genius desk" at an apple store and ask them they almost always have an answer instantly as they know all the latest info and may have answered the question for others before... and it's free. :D