I don't want to make you sound stupid but did you find the drivers? If Windows doesn't recognize it, the only way it'll show up in Device Manager is to manually install the drivers.
There was a driver cd with the card so i did have the drivers, what i'm saying is that it didn't ask for any drivers then i connected the card, i manually installed the drivers but there wasn't a trace in device manager of the card.
I even sent a mail to the company that produces these card's, didn't get an reply, i even found out the manufacturer (Gyrosignal) of the hardware inside the card to see if i could find some new drivers, but there wasn't any on their site.
I don't think the card was faulty, more a fake product, since the lack of support of the product.