What usb driver? the usb controller or the usb device plugged into a usb port?
If you are needing a driver for the usb controller, it's included with the OS.
USB 1.1 support is all you get with just Windows XP.
USB 2.0 support only comes with SP1 or SP2 updates.
If you need a driver for a usb device, please describe the usb device.