I put together a new system about two weeks ago and the system detected all the new hardware without any problems. After about two weeks I fire up the system and while I'm eating my Lucky Charms at 8:00 am in front of the computer it reports, "Unknown Device Successfully Installed". I didn't add anything lately. Opening up Device Manager, I see the mystery device in the Universal Serial Bus controllers. I think fairies added a new piece of hardware while I was sleeping last night. What could this be?