Olimex AVR-USB-162 Dev Board Not Registering with O/S

I’m working on my first robotics project and ordered an olimex avr-usb-162 development board from sparkfun.com.

When I plug the board (via USB) to my linux machine or my windows xp machine - the LED on the board blinks - but the O/S doesn’t see the board as a new device.

Has anyone ever encountered this? Is my board faulty - or is there something I have to do to make my system see this board.