Illusion games all aren't quite friendly with Vista, so I suggest setting the compatibility mode to Windows XP SP2. :)
Still not working? Well then you can slap me...
Enjoy!
-Remember this, always try the mentioned method when something fails to run in Vista(especially if its from Illusion). If it still fails, try doing a google search. Why the search when you can just post here? Then you'll be able to post exactly like what I'm doing here with my post right now! HAH!