Trying to load Windows 7 ultimate on MacBook

I have not been able to install Windows 7 using the Boot camp application. I have two Windows disc 32 and 64 bit. Does not matter which I put in. Boot camp shows it is loading, but then takes me to a light black screen with a blinking curser and nothing happens other than locking up. I am logged in under administrator in users and it does not matter which user I am. When I reboot using the option key held down it shows Mac hard drive, Mac Restore and then Windows. Click on Windows and back to the light black screen. Then I reboot again and go to Boot Camp and it says do I want to uninstall Windows. I pick yes. When I try to partition I use 125gb, but it's almost like the computer is not partitioning at all. What am I doing wrong?