I have a brand new macbook pro and have attempted installing the flash player many times with safari. I have adjusted my security settings, gone in as a new user and under safe mode. Every time, I follow the steps and the installation gets stuck at 7% and then the box simply disappears a minute or two later. I do not have an older version on the computer; it is brand new. If you could offer some help, this would be greatly appreciated.
Can you please try out the solutions listed in the following page: http://helpx.adobe.com/flash-player/kb/installation-problems-flash-player-mac.html?
Hope that your issue is resolved.
If your problem still persists, please let us know.