I'd go to www.adobe.com and download the latest version of Flash for your browser. If it installs OK, it's good. If there is some error installing it, run their removal tool first.
But it could be you have some malware in your browser also. Then updating Flash won't help.
Hello - There is a recent occurrence on my computer (it has windows 7 pro) of a popup that appears on almost every site I enter. A black square of varying size appears somewhere on the screen - usually near the printed space of my page but sometimes in the middle of it - declaring that "this plugin is vulnerable and should be updated. Check for updates... Activate Adobe Flash". When I do it, the screen fills with ads and promos of varying sizes, none of it related to my text. If I don't, the black space stays there preventing me from using the screen as I see fit. Some very few have a "delete" or "close" space, there is no way of doing that on all the others. Is there anyone who can tell me how to get rid of this bother? Thanks - Amos