The best option is: Deinstall your flash player, restart computer and after reinstall flash player from the adobe site, then restart your computer and you are set! This is the all-round safest way to be sure that your installation works properly. Although on the modern computers you do not have to restart your machine the whole time - this way you can feel certain that it works! I hope this helps!
On the other note: Does flash player in your browser work properly?