My computer USB drive is

Question

My computer USB drive is not picking up my new freecom mobile drive (250gb). Im running on WindowsXP. The drivers for the drive are not being installed and the device is not recognised when connected to the laptop. It isnt the USB drives because they pick up other devices when inserted. The freecom mobile drive switches on and starts running (you can feel it) when connected, but nothing else happens. I also cannot see the "unallocated" drive in my computer. I need help ASAP. Thanks.