Download the following files by right clicking and selecting "Save target as"
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 UNINSTALLER to remove all instances of Flash Player.
Next, run the Installer for other browsers.
Once Flash Player is installed go to: http://www.adobe.com/shockwave/download/alternates/#sp
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 dwonload the FULL ActiveX installer.