I would download and make this Partition Wizard Boot CD to do all your partitioning b4 you install the OS.
1) Download the iso from here: Partition Wizard Bootable CD allows user to manage partition directly with partition manager bootable CD.
2) Burn it to a cd using Imgburn: ImgBurn - CNET Download.com
3) Drop it in the tray and restart the pc.
4) Boot from the cd
5) Create your partitions with it.
There are videos at the site on how to use it. It is a great tool.
After that install windows on the partition you created for it.
Also, read Greg`s tutorials, they are flawless.