I have Windows 7 and use Firefox. I received a message from Adobe that a new version of Flash Player (Flash Player 12) should be downloaded. I tried ... no luck in installing. The message comes back "could not install, Actionlist not found (or similar words)."
So I tried to solve the prolem and ended up uninstalling the version of Flash Player on the system and trying again to install Flash Player 12. Same error message and I don't know where to go from here.