Why use that partitioner? Windows 7's partitioner is GREAT
! Just right-click the computer icon in the start menu. Click on Disk Management and WHAMMO!
P.S. It may take a while to load your first time.
After it loads - right click your hard drive and click "Shrink Volume". After you go through the dialogs and create the new unallocated space, right click the new space and create a new partition thingy.