Unknown Devices. Pretty useful Windows freeware tool if you ever come up against one of the dreaded, ‘Windows cannot install the driver for this device’ type messages.

 Unknown Devices helps you find what those unknown devices in Device Manager really are. By checking Device Manager for unknown devices and extracting information from it, this program attempts to figure out what the device is. You might not have to open your case or look up random numbers off of PCI cards to figure out what they are.