I couldn't find SMCWLAN-G but I found SMCWPCI-G; there's apparently 2 versions of the card, one with Atheros 5005G chipset (well supported under all OSes incl Win7) and one with RTL8185L chipset - support of that under Win7 is debated. Which cards do you have? Also since most drivers are supplied as .INFs they shouldn't be able to ask for a specific OS?