Are you running XP with SP1 (or, alternatively, SP2) installed? SP1 (and SP2) includes an update for USB 2.0
Also, check in Device Manager that it says "USB 2.0 Host Controller" or 'Enhanced USB Controller' under the Universal Serial Bus section of the hardware list. If it doesn't say one or the other then the card has not been detected properly and needs either the supplied drivers or SP1/2
I have windows xp sp2
Yea just checked device manager and here's what came up
NEC PCI to USB Open Host Controller x 2
Standard Enhanced PCI to USB Host Controller x 2
Standard OpenHCD USB Host Controller x 2
and then there's about 6 usb root hubs 2 of which are for the card