Technically, you do have to partition your hard drive.
First, you'll need a book disk (not the Windows one, because it creates a RAM drive). <A HREF="http://content.techweb.com/winmag/columns/explorer/1999/1025.htm" target="_new">Click here</A> for that article (I've been using the same one for over a year...)
Then, use FDISK to create one single primary partition. Just use your whole drive. After rebooting with the same disk, format c: and your drive is ready to have the OS installed.
The reason why I would agree with the earlier post on having more than one partition is because if Windows gets screwed up, your data is safe on the other partition.
I don't feel like going into more detail, but post back if you want more (I check the boards often).