Tony,
Since the 8156B came out significantly before XP was released, there are not any peripheral drivers specifically for XP. That being said, there are drivers for Win 2K, which may work with XP as well. Here is a link to the driver package on NI's FTP site:
8156B Win 2K Drivers. I hope these help, have a good day!
<-*DrkOvrlord*->