There are a couple of things you could look into.
The first is the Flash Player Settings Manager;
http://www.macromedia.com/support/do...manager06.html Assuming it works as claimed, this enables you to restrict what gets installed on your system (and should show you what is currently there).
Another, more radical option, is a tool called 'Flush Flash' ;
http://www.xs4all.nl/~fstaal01/flushflash-us.html I've used this a couple of times and nothing actually blew up, but it's definitely an 'at your own risk' option because your computer could be very different to mine so this tool could break it.
EDIT. Ooops! I see the late addition got delayed. Anyway I think the message is clear enough.