Microsoft credits a February update for XP and Vista for dramatically dropping infection rates of AutoRun-abusing malware. Infection rates of XP Service Pack 3 (SP3) have dropped by 62% since January 2011. XP SP1’s infection rate has fallen by 68% while Vista SP2’s has plunged by 82% in the same period. Microsoft changed AutoRun’s behavior in Windows 7 to block automatic execution of files on a USB drive. With the update in place, flash drives inserted into a PC running XP or Vista no longer offer option to run programs.”]

