HI and welcome to Apple Discussions...
Bear with me here... you may have downloaded a corrupted file for Flash... try this. Uninstall the Flash plugin and reinstall a fresh copy.


http://kb2.adobe.com/cps/141/tn_14157.html?promoid=DTEGO
When you are finished uninstalling the old Flash plugin, go here and install a fresh copy 
of Flash Player plugin.
http://get.adobe.com/flashplayer/
As with any software installations, repair disk permissions.


Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.
Carolyn 🙂
Message was edited by: Carolyn Samit