usb device not recognised

[emperor2013]

i am getting usb device not recognised but...........i have nothing plugged in!!!! only started happening a few days ago. its a windows7 pc and was working fine up to a couple of days ago

 

[Sample_Text_420_Blaze_It]

Hi,
Some USB devices are built-in such as WebCam, Touchpad, FingerPrint Reader, and others so it could
be one of those or a total glitch.