I have Flash Player 20.0.306 installed, but when I try to watch videos, I get a message saying I need to Install Flash Player 9. I've tried using CHROME, IE & Firefox. What do I need to do?

I have flash player 20.0.0.306 installed on my pc. I'm trying to watch videos, and I keep getting a message saying I have to install Flash Player 9. I've tried Chrome, IE & Firefox...what should I do?