I want to separate my macbook into the minimum 5GB for two small games, both are not capable of working on my mac -using crossover-

I fix and verified my Disk many times, and still the same answer!
" Boot Camp Assistant " is the file's name, and it was in my utilities folder.
So is there another boot camp or another free " run-windows-on-mac " kinda software?
I've tried the trial of Parallels and I couldn't work that so :S

But please tell me:
1. If there's a way to fix my main problem
2. If not the first one, if there's another boot camp program + link please :P
3. A Whole new FREE software that lets me run windows on my mac