Arduino101 USB driver

hello,
I have trouble with USB driver of 101 board – there are 2 devices marked yellow in the WIN XP device manager (both named ARDUINO 101) that “found new hardware” wizard could not find a suitable driver to install. The USB virtual part was com3, but the IDE only had com1 to choose from.

Where can I find right drivers to install? Does the 101 board core support WIN XP at all?

Thanks a lot!

Xin