Download the following files by right clicking and selecting "Save target as" or "Save Link as".
Flash Player for ActiveX (Internet Explorer)
Flash Player Plug-in (All other browsers)
Save ALL files to your Downloads folder - DO NOT RUN anything yet.
Reboot your system.
BEFORE opening anything else, go to your Downloads folder and run the UNINSTALLERS to remove all instances of Flash Player and Shockwave.
Next, run the ActiveX Installer.
Lastly, run the Installer for other browsers.
Once Flash Player is installed go to: http://www.adobe.com/shockwave/download/alternates/#sp using Internet Explorer.
Download BOTH files, the one on the right FIRST by right clicking and selecting "Save target as"... the other by clicking and following the steps to download the FULL ActiveX installer.
Once everything is installed, see:Enabling Flash Player in Internet Explorer and: ActiveX Filtering in Internet Explorer to make 100% sure that Flash Player is enabled and NOT being blocked by ActiveX controls.