System extension v.5 required ?

I updated my quicktime but when I try to use it it gives a pop up that says\I need a quicktime system extension version 5 or higher and gives me the www.apple.com/quicktime site to get it but can't figure out what I need or how to install it
HELP

Does this happen when opening QT, or while surfing websites? What version of QT was on the computer before updating and what version did it update to?

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