I had a firewire PCI card that came with my Sony Camcorder (when firewire had just been adopted) . The driver from the disk had problems and they did not have an update at Sony. The chipset was Texas Instruments, I was able to find several other card drivers with the same chipset but I could not get any to work. I finally just bought another brand firewire card.

If you can't seem to get it working, a new card is a little as $13 US
Newegg.com - SYBA PCI to Firewire 1394a 3+1 ports controller card Model SD-NEC-4F - Add-On Cards