What does "try and open it it wont work" mean? What happens (step-by-step details) when you try to open the installer? What is the name of the installer file you are using?
What website are you trying to visit? If the website requires Flash Player it'll specify which plugin is required, it shouldn't be a generic 'missing' plugin message.
<edit> What version of Safari is this on?
like when I try to open the file of the flash player after it has already been downloaded it wont open and im trying to visit a web page for my work so that I can work from home. the version of safari is 5.1.10 if I need to update safari how would I do that.. I need this done asap because work would like to me to work from home tomorrow. please help thank you for your time
What is the name of the installer file you are downloading?
I am not able to reproduce the behaviour as described. Using the installer file downloaded from https://get.adobe.com/flashplayer. After the installer downloads, double-clicking on the DMG file mounts the Disk Image, then double-clicking on the Install Flash Player.app file launches the installer dialog window.
Safari 5.1.10 is the latest Safari version for OS X 10.6.8. The only way to update to a newer version of Safari is to update the OS to a newer version (if possible).
<edited to fix some typos>