GParted doesn't drivers since it's self contained. Once you grab the slider or increase the space following the Vista primary you simply click on the "apply" button on the menu bar. A confirmation prompt will then appear where you answer yes to that.
Following the confirmation you will see another small popup appear with a small tab going back and forth. That reminds you of the first splash screen seen when loading Windows up there letting you know it's busy at work putting the change into effect.
As far the drivers needed they are found on the mother board cd or at the manufacturer's support site. In order to slipstream the contents of a Windows disk and the drivers you have to have at least a cd burner for XP. On a case without a burner ut oh...!
That's where you put a 3 1/2" to 5 1/4" drive bay adapter into one of the upper drive bays to see a floppy drive added.