Thanks for that. I'll try pressing "Play", but I don't think that that's the problem- it seems to be more likely to be the Firewire card.
As I mentioned, when I pressed the "Scan for hardware changes" button, my computer immediately conked out! I'm going to try sticking the Firewire card into another PCI slot.
As I mentioned, I'm running Win 2000. I can't remember the card came with a driver CD, or whether, (I think), Win 2000 has drivers installed already. Anyone know?