I am afraid it could be any number of things tbh. I would need some more information. Can you email us your computer specifications? either through info or support @ xformgames.
That should be more then enough. Mayb e it is the resolution and/or settings?
Do you have any of the advanced settings on? While your system should be able to have them on maybe there is some sort of conflict? The advanced settings as well as high resolutions aren't very well supported due to engine limitations. So these are a bit experimental.