Cant Build a exe in FPS Creator?

I have recently got fps creator and i am totally loving it. i have spent hours on it. I have built a game, all complete and it works but when i go to build the game as a .exe file, it stops responding, well it doesn't build so i do ctr alt delete and i click start task manager and end fps Creator and it says "are you sure you want to end the Application, it is not responding. i just wanted to know how i can fix this so i can make a .exe