Hi Andy and welcome to the forum.
AFAIK DV devices do not have drivers. All the required information is either part of the firewire host or the firewire device (your camcorder).
When you connect everything up make sure you do it in the following order to make sure all hardware etc is found as required:
Switch off PC*
connect cam to PC via firewire**
power on cam (in VCR mode)
Boot PC*
Start the editing software (Studio 9)
* optional
** don't run cam on battery, connect it to mains
The software should now be able to see the camcorder and control it.
If Windows comes up with the 'found new hardware' window just cancel it.
Mark.