With the card installed, go to Device Manager and locate the 'unknown' PCI device. Open the device properties and get the PCI Device ID, which for XP is shown under the Details tab/page (I don't know if its the same for Vista).
There are three elements to the PCI Device ID; VEN, DEV, and SUBSYS. It should look like this:
PCI\VEN_xxxx&DEV_xxxx&SUBSYS_xxxxxxxx
In the example above, 'x' could be any alphanumeric character.
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