In general, most PC cards will have an FCC ID on them.
If you can find that number (It will actually say FCC XXX-XXX-XXX etc),
Google FCC ID and input the number at that website.
It will at least get you a manufacturer, then you may be able to go to the manufacturer's site and find the card, then the driver.
It's a long shot, but has worked for me in the past.
Good luck