Terrey,
I just read the manual for your mobo. Unfortunately they do not list which PCI Slots share IRQs with other devices. So it is hard to guess. I would try putting the FireWire card in the middle PCI Slot. If that does not work, you can try the other two.
Have you tried manually adding the Hardware Driver using
Add Hardware in the
Control Panel?
Right now the latest BIOS Revision for you mobo is F12, you can get it here:
BIOS of GA-8SIMLH
You could also download the latest SiS651 Mobo Drivers here:
Download Center
Take Care,
Richard