Why is Grapher playing my videos, not Quicktime?

I have downloaded Quicktime twice, but my laptop keeps ignoring it and using grapher to play my videos, not very well, it's very frustrating. How can I disable Grapher and make Quicktime my default again? Thanks

Select one of the videos in the Finder and open the Info window. Set it to be opened with QuickTime Player, then click the Change All button.

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http://windows.microsoft.com/en-CA/windows/which-operating-system
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