Dell Lattitude 5520 windows 7
unknown device showing in device manager.. hardware ID shows USB/UNKNOWN.
system is not on a docking station.. there are no devices plugged into the laptop
pulled root hubs.. and rebooted.. no change.
reinstalled chipset.. rebooted.. no change
system is working normally except for a msg that there is a missing device.
virus / malware scan shows clear
how can I find out what that device is ?