Quit Safari. (Don't just close the window - press Cmd+Q to quit it altogether - a lot of people who switch from Windows to Mac don't realize at first that if you close the window, it DOESN'T quit the application like with Windows - it only closes the window but the app is still running, as the little "light" under the icon in the dock will indicate)
Go to: Mac HD/Library/Internet Plugins.
If the Flash Player Plugin is there, trash it, and empty the trash. If not, never mind that step.
Mount the Flash Player DMG and run the installer.
Relaunch Safari and you should be good to go.
Thank you, C F. That worked !!