Hi,

Is it listed in the device manager?

Is it marked with an exclamation point. That indicates an error.

Try to remove it from the device manager, then scan for hardware changes. It should pop-up.

Move it to another PCI slot, Windows XP is ACPI capable, which your 98 wasn't. Sometimes that mucks around with IRQs and moving the card can help.

I gather that you have used up all the on-board IDE ports?