Adobe Flash Player update

When I check what version of Flash Player I have in my Control Panel it says I have Version 17,0,0,191 installed but when I check for updates on the Adobe Flash Player web site it says I have Version 18,0,0,203 installed. Just wondering which one is correct and why the conflicting info? I recently received a warning from Norton re: security concerns with the latest update of Flash Player and we should update it to prevent possible security issues (although Norton also said if you have Live Updated Norton 360 you should be protected already).