Go to HD/Library/Internet Plug-Ins folder and delete "Flash Player.plugin" as well as "flashplayer.xpt".
Download dmg file from Adobe site and save to disc. Quit any browsers you have open. Double click on dmg file. that opens a folder which contains "Flash Player.plugin" and "flashplayer.xpt" ... drag both into the Internet Plug-Ins folder. Do a restart and you should be in business!
the actual link to the above is http://forums.adobe.com/thread/415443;jsessionid=3D5B36974427A92D43663CE464E9023D.node0?tstart=1