DV = Firewire = ieee1394 = iLink
if you were confused before your probably even more so now
If you need to add firewire to a PC (rather than just a laptop as already explained by Mark) then you can add a PCI card such as
This which should include the cable to connect the cam to the card.
If your PC and laptop already have firewire (look in Device Manager for ieee1394. If its listed then you have firewire installed) then you should be able to get a firewire cable on its own, but expect to pay about the same as for the card & cable. There is no need to pay over the odds for a specific make of cable, it will offer no advantage for video capture.
Mark.