Download the following files by right clicking and selecting "Save target as" or "Save Link as". (you may need to disable your antivirus if it still gives you an alert when right clicking to save.)
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 ActiveX Installer.
Lastly, run the Installer for other browsers.