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Microsoft has released an update for Windows Vista to limit AutoRun entries in the AutoPlay dialog to CD and DVD drives.
Update to restrict AutoRun
AutoRun is the ability of a device to discover a set of tasks for the user when inserting new media into the computer using autorun.inf. This may be a USB stick, CD or DVD, a network drive or other new media. AutoRun tasks are displayed to the user with other functions via the AutoPlay dialog box.
Authorun is different from AutoPlay. Auto-run is used to automatically start certain advanced multimedia programs or content when you insert a CD, DVD or other type of media into your computer. AutoPlay allows you to choose the program to use to start different types of media such as DVDs, CDs, etc. that contain music, videos, photos, etc.
The Windows 7 team took a dramatic step to block this specific threat as the use of AutoRun system malware increased.
To restrict AutoRun entries in the AutoPlay dialog box of Windows Vista, please download and install the patch available under KB971029.
Microsoft has made some changes to the AutoRun function under Windows 7. You should probably read this post, too.