...Microsoft has revised this advisory to notify users of an update to Autorun that restricts AutoPlay functionality to CD-ROM and DVD-ROM media. This update is intended to stop AutoPlay functionality from working on USB drives, external hard drives, or network shares. This update is available for Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008. For more information about this update as well as the download links, see Microsoft Knowledge Base Article 971029.
Update to the AutoPlay functionality in Windows
Includes the download links for applicable OS.