On Tuesday US-CERT, the United States Computer Emergency Readiness Team, warned that the instructions given by Microsoft to disable AutoRun, a protective measure to prevent infection by the “Downadup” worm, are ineffective and erroneous. AutoRun, when enabled, tells Windows to automatically run any program specified in the “autorun.inf” on a removeable storage device (like s flash drive). “Downadup” creates an autorun.inf file at the root directory of any USB-based device it finds connected to the infected machine.