Bootcamp windows 7 not right format. How do I change that?

I'm trying to install windows 7 professional onto my mac, so I have a usb drive with the iso file and I can run bootcamp on it, but then I get to the install screen and it says it isn't the right format. How do I change that? Also, instead of putting windows onto my usb drive, I want to partition my hdd so that I can boot it without the usb drive.  What am I doing incorrectly?

You did not read and follow the Boot Camp instructions located here, https://www.apple.com/support/bootcamp/, or available when you run Boot Camp Assistant. When you run Boot Camp Assistant your drive will be partitioned. When you get to the step to partition the drive select partition. Windows will be installed on the NTFS formatted Boot Camp partition.

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