What version of Flash Player do you have installed? The only time this application should appear is during a Flash Player install or uninstall. It could be that the application you were installing attempted to install a different version of the Player. What app were you installing when this occurred?
Well I seem to have a few versions on my system, not sure how to tell which one is actually in use. The most recent is Adobe Flash CS5 22.214.171.1245.
I downloaded the Mac App "Relax Melodies" from the Apple site, right after that the Flash Install Manager appeared in my dock.