buteman is correct, there isn't a 64 bit flash player yet. If you are running Flash Player from within IE8 then you will need to run the 32 bit version of IE8. On my PC the IE Icon pinned to the taskbar launched the 64 bit version but both versions are available from the Start menu. Check from Help, About to see which version of IE8 you are running. I unpinned the 64 bit version from the taskbar and pinned the 32 bit version in its place then flash works ok.