Moving this discussion to the Installing Flash Player forum.
Welcome to Adobe Forums,
Download and Run Adobe Flash Player Uninstaller from here : http://download.macromedia.com/pub/flash/ts/uninstall_flash_player_osx_10.2.dmg
Download Flash Player 11 for MAC from here : http://fpdownload.macromedia.com/pub/flashplayer/current/licensing/mac/install_flash_playe r_11_osx_intel.dmg
If you still recieve Errors, then try to follow this process from "root" user in MAC
Enabling Root User :
Hope this helps !!