how to identify pci to usb controller

I’m having problems identifying my pci to usb controller card. The chip is by Viatech, but their driver (it says ‘filter driver’) doesn’t work with win2k as promised (it was working with winME and win98 fine) Win2k sez it’s unsupported by it, so I need proper driver, but perhaps the maker of the board has something to do with it.