Windows 7 will no longer display the AutoRun task in the AutoPlay dialog for devices that are not CDs or DVDs. This means, that when you insert a USB thumb drive youll see a. malicious program pretending to be the safe option (circled in red) of viewing and opening files. The next version of Windows will change the way in which the operating system handles USB flash drives to. fight the growing problem of AutoRun malware like the Conficker worm can spread via USB.”]
Source: https://grahamcluley.com/microsoft-improves-autoplay-combat-usb-malware/