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, run the UNINSTALLER from your downoads folder.
Next run the Flash Player for ActiveX installer, and lastly, if you use any other browser, run the Flash Player Plug-in installer.
If IE stil gives you trouble, see:Enabling Flash Player in Internet Explorer