Trying to install Flash 11.5 on Mac OS X 10.6.8. Install completes but Flash does not work - any help?

Hi, I was told I didn't have Flash 7 when trying to see something online (which I am sure was incorrent to begin with) so I followed the provided link to download Flash version 11.5. The download completed without problems but Flash doesn't seem to work at all. I have uninstalled, reinstalled and restarted. I don't know what to try next, any help would be much appreciated!