Sorry for re-surfacing the old thread, but anyway...
Can't say I've heard about 86-bit Windows so far, so I am pretty certain that you have either a 32-bit or 64-bit Windows

As for starting and playing the game under Windows 7 then I also could not play it at first - whenever I started it the game just totally crashed. But, when I right clicked on every executable file in JE folder, went to properties and set them to run in Win XP compatibility mode, they all started up without any issues and still work very well. Over a very long time I was finally able to play JE again, under Win 7 64-bit this time.