I didn't find a US ROBOTICS XP. Reading http://www.usr.com/support/s-windows.asp I find some items work on Vista but you didn't tell what you had.
some times last week on line I order a US robotics modem for a window vista in the mail today I got a US robotics XP. I look on there web pg. and found a few numbers I left a couple of message ask them to call me back and of coarse I told they sent XP instead of vista. I have not had much luck when any thing on this computer is Like this modem when they say they call back I just have to Waite see. I also talk to two different people that said said they were the wrong ones to talk to about this and did not know the phone number to where to call about this problems. I thought I write here and see what you would say about it. thanks sham1313