My Quicktime will not open, and therefore when I try to play a video I get a message saying I need to download Quicktime, but I cannot do that as when I try, I get a message saying I already have it.  How do I un-install Quicktime so I can re-install it?

I am having issues with Quicktime.  It would not open, so I tried to "delete" it and re-intall.  When I did that, it would not let me install it and I got a message saying it could not install because I already had it.
So, I guess what I need to know is how do I un-install Quicktime (even though the icon is gone) and then re-install it.
Thanks!

Yes I had that problem this week.  Did search in finder and dragged all files to trash,including any attempted down loads of updated quicktime, emptied, restarted and then down loaded latest version and all ok.

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