EV2400 recognized as unknown device

Hi,

I just bought a EV2400 and when I plug it into any USB available in my computer (W7-64 bit), the device is not recognized.

It's shown as unknown device in device manager with the following status: "Windows has stopped this device because it has reported problems. (Code 43)"

I had another module that stopped working all of a sudden with all lights off, so I bought this one.

What do you think is wrong with this module?

Thanks,

RI