If your file crashes as soon as you run it, chances are you have a bad download. The Web Arym Knife has been tested on each and every version of windows to be completely compatible.
Please re-download the software from the link you received via email when you first purchased it, and then to be on the safe side, quit all other programs that you're running.
If you still experience a crash, you can open a tech support ticket explaining the problem using the link below.