What is your operating system, version & edition?
What is your web browser?
You do not need an Adobe password to install Flash Player, but you may need your local computer's admin password.
[topic moved to Flash Player forum]
You'll need to run an older version of Flash Player. Here's a FAQ that explains what's needed:
I use a Mac G4 with OSX 10.6.8. Nothing at all, NOTHING!, happened when I tried to download the uninstaller! Nothing on that FAQ worked! Shall I give up? I get Facebook videos from a friend that play fine, but nothing else does. What’s the difference?
What version is reported installed when you go to this page?