Thanks, all who responded.   But the problem has now become moot.   I removed the drivers as advised, preparatory to installing Maximus Decim Native USB ver.2.2 (which, by the way, won't work with my ME system).  When I plugged the device in a second time the drivers were reloaded and now it works fine. The drive, by the way, is an Ativa from Office Depot.  I could never discover who makes it.