You have to install the manufacturer's Win7 driver software but can't help you on where to get that as all references coming up on Google are not in English (appears to be Polish I think, which I do not understand).
Depending on the age of the wheel, there might not even be any Win7 drivers for it.
One thing is certain though, it does need a driver, Windows 7 doesn't support hardware like that without a driver. It's not a "plug and play" device like a mouse or a keyboard.