Note that this is not a Retain issue.
Make sure you have the latest version of Adobe Flash Player installed. To download the latest version follow the link in the error message "Proceed to download page".
If you already installed Adobe Flash Player, check if both Adobe Flash Player ActiveX and the Plugin are installed.
(Ignore the Adobe Flash Player version number in the screenshot. This version might be outdated when you are viewing this article)
In case one of them is missing also follow the link to the download page and download the missing Flash Player component.
Have a look at following Adobe Forum Thread for more information.