I believe you can get this to work for a price that is totally unreasonable.

Before you try it tho, try plugging the speakers into a powered USB hub. If your computer is picking them up as USB speakers then there is a chance they will work with the right amount of power.

Now if that failes, and it probably will, Try this for a hefty $99
http://www.griffintechnology.com/products/powerwave/index.php

The audio-specific usb hub from Griffin promises your'll be able to use them with ANY USB enabled computer.

I find it difficult to beleive that USB speakers need product-specific drivers on any platform, but stranger things have happened.