What do I do about the Flash Player "stop installing all applications?" window?

[kascoty]

This window will not close.  It prevents my mac from shutting down.  It also prevents me from downloading any other programs or updates.  Flash player is successfully downloaded on my computer.

[pwillener]

http://forums.adobe.com/thread/1195540

Also, can you post a screenshot of that message, as I have no idea what it means.  See http://forums.adobe.com/thread/1070933