To say it needs no drivers is misleading. You know it needs drivers it's just not supposed to need proprietary ones.
This is an excerp from MS and I'll also post a link to the 1090 problems with win2K and USB:

Bad or Missing Device Driver
Windows 2000 supplies class device drivers for a number of USB devices. When a USB device is plugged in, it should be loaded and configured without ever requesting a device driver (provided that it fits within the defined and supplied class drivers). If it prompts for a device driver, check with the manufacturer of that device to determine if a driver is available. The fact that a device works in Microsoft Windows 95 or Microsoft Windows 98 does not mean that it works with Windows 2000. After you load the device driver, if you receive an error message stating that the driver has not been signed, consider that driver suspect. It means that Microsoft has not been able to verify that the driver you have supplied is fully compatible with Windows 2000. Because of this, Microsoft has no way of fixing the device problem short of getting a signed driver from the manufacturer.

Check the event log for errors relating to any of the following components: Hidclass.sys, Hidusb.sys, Usbhub.sys, Usbd.sys, Uhcd.sys, or Openhci.sys. The device may have attempted to insert replacements to the Windows device driver stack, which could cause the entire bus to become unstable.

http://support.microsoft.com/search/defa...1131&range=

John
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