Zhone 6211 no driver usb for WinXp, only for Vista and Windows 7.

Please ensure that your PC is updated to accept/connect to USB devices in your (O/S).

Download your USB DSL modem driver at this link: http://www.zhone.com/support/downloads/drivers/

You have to check your modem specs though. It looks like this:
ADSL+, 6211-I2, Bridge/Router. etc.

After you download it, install the driver (plug out the modem and plug it in back. The USB detection will initiate, and ask for driver. Use the downloaded driver and
it will say NDIS Remote Driver..... THIS IS FINE. You may have to go to network in control panel and make your fine tuning as you require (setup lan icon, firewall, etc). Thats it !

PS. Yes it does work. I just installed it about an hour ago, USB and all, WindowsXP 64 bit !