How do I uninstall QT 10 so I can go back to QT 7?

QT suddenly quit working on my Mac with Snow Leopard. I called tech support and was told that QT 10 has been quirky and I should install QT 7 from the Snow Leopard disks. I did that, but QT opens in 10 and won't play video.
How do I get rid of QT10 so only QT7 will open (and, hopefully, play my videos)?

Snow Leopard users can have two versions of QuickTime (X and 7.6.6) and use them both at the same time. There is no need to try and remove QuickTime X.
Right click (Control click) on the file icon you're trying to open to choose QuickTime Player.

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How do I uninstall QT 10 so I can go back to QT 7?

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