Downloaded Adobe Flash Player-Yet still getting "Get the Latest Flash Player Messages?

Downloaded Adobe Flash Player. 3 times. Yet I am still unable to watch certain videos on YouTube as the same message keeps appearing: "The Adobe Flash Player is required for video playback- Get the latest Adobe Flash Player"

I have installed it already 3 times and yet nothing has changed the same message keeps popping up. I shouldn't have even bothered downloading it.

How do I make it work??

A disappointed customer.