You can of course have it be 100% Windows.
When you create a partition, Apple only creates a FAT32 and the guide tells you to look for the "BOOTCAMP" (that is its name, over used) then click Advanced - Options and format as NTFS. Then continue iwth the install.
If you install or reinstall with all the discs - installers have a tendency to throw files all over a partition. And what you need is contiguous consolidated unfragmented free space out of which to create and set aside 50GB or so for Windows 7.
And I would not use 32-bit versions. Unless it only has 2GB and can't go higher.
You can buy Windows System Builder Home Premium 64-bit $99
Windows 8 Customer Preview is a free ISO also (burning ISO has to be done at slowest reduced burn speed in order to work - a bug with Apple Disk Utility.