firewire is a port that rivals USB (it's faster then USB, at least it used to be). It looks similar to USB too, it's probably built into your mobo.
You might be able to disable it in the bios, so give that a try first then post the results if you can(not) do it and if it did(n't) work.
Always try googling problems too, it's amazing what google provides for answers:
(this very website!)
So yeah give that a try too.