How to Use Disk Management to Extend a Partition in Windows Vista
You can use Disk Management to extend a partition in Windows Vista. Extending a partition adds to your drive space by borrowing from an adjoining partition on your hard drive and makes your system utilize memory more efficiently.
Choose Start→Control Panel→System and Maintenance→Administrative Tools.
You have to be logged on as a system administrator to complete this process.
Double-click Computer Management and click Disk Management in the list on the left.The Computer Management window.
Right-click a disk in the top center pane (this is usually your hard drive) that isn’t allocated, and then choose Extend Volume from the shortcut menu that appears.The Disk Management window.
Follow the steps in the New Simple Volume Wizard to create the new partition.
You can also shrink a drive, which frees up some space for you to create a new partition at the end of a volume. The Shrink Volume command is located on the shortcut menu that appears when you right-click a disk in the Disk Management window.