If you still have the problem (or for future reference)
just uninstall all unity web players in your "Add/re,ove programs" list.
(NOT Unity Editor....that's something else, if you have it. It's
just the Unity game engine software which is not linked to your browser.)
Then download unity web player again.
You may have to do some trial and error by trying either
the version suggested on FusionFall (when it loads? You know, it says the BETA version)
or the latest version from the official Unity website.
"Sometimes you gotta run before you can walk." - Tony Stark, Iron Man.