Have you loaded/installed any new software which may include RealPlayer ?

Normally, when you install new Players (and many other file reading/playing/viewing programs) they automatically configure themselves to become the new Default application.
Nasty habit but they almost all seem to do it !!!

Go to your setup page for QT and reset it as your Default Player.
(You may also need to go into RealPlayer and deselect it as the Default Player... (Sorry, I'm not sure if the last part is necessary or not.)

ciao

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