Boot Camp Assistant makes my Mac crash

Hi Guys

The situation is like this:

After choosing the partition, and when start to partition my hard drive, things go haywire.

It never finishes partitioning, because when I do something. like move my mouse to the Dock, my computer crashes.😕😕

I have to Hard Shut down my computer, as it froze and I cannot do anything.😢😢

Anyways have a solution??? 😕😕