I have problem MoI 2 is craching

 From:  sysgrunge
Hi i am new using Moment of inspiration 2 for me is a new generation of 3d model programs.
But the motive of my post here is that i downloaded the demo version and every time i have problem MoI is craching if i try to make a bevel crash, when export models crash, when i using boolean too i don't know what's wrong.

Anybody can help me please.

My system is Windows 7 64bit
my processor is an AMD Phenom II x4
8GB of memory ram
Nvidia Geforce 470 GTX