I have a temporary, (though not perfect), workaround for this. Right click on the offending unknown device and select to update driver. When the wizard starts select to install from a list or specified location. Next, choose "Don't search. I will choose the driver to install." Next, scroll down to "System Devices" and select. Next, from the Manufacturers list scroll down to Intel and highlight. On the right hand side under the model column scroll down and select "IntelÂ® 82810FB LPC Interface Controller - 2640 (Intel) Next, disregard the warning and proceed with the driver update. Reboot. You will find in the Device Manager under "System Devices" 2 instances of the above driver, but the "Unknown device" will be gone.