This unknown device is your Ageia PhysX card.  Try loading THIS driver <ADMIN NOTE: Broken link has been removed from this post by Dell> for 64 bit or  32bit
I recently upgraded to windows 7 from windows xp and windows seven cant seem to find a driver for my XPS 720, and i've downloaded and installed every driver aviliable from the driver download section for my xps but still the little (!) icon is beside it, How oh how can i fix this please help.
Windows & ultimate Edition PCI driver???