You can partition and format drives using only VISTA software.
Right-Click on the "My Computer" icon either on your desktop or in the Start Menu and select "Manage."
A new window titled "Computer Management" comes up.
Select "Storage" from the left hand side by clicking it once, then select "Disk Management(local)" from the right side by double-clicking it. Find your external drive and right click on it you can then partition it and after that's completed right click on the drive to format it.