Please post back a screenshot of your full Disk Management drive map with listings, using Snipping Tool in Start Menu, and we will give you the exact steps.
You need to back up your files anyway whenever doing repartioning. If you can't put them on another HD, external or DVD, or transfer them over the network to another computer, you can get 25gb worth of free storage on Windows Skydrive with each Windows Live ID. Google Skydrive.