The Auto-Play features are changed in Control Panel
Open AutoPlay by clicking the Start button , clicking Control Panel, clicking Hardware and Sound, and then clicking AutoPlay.
From this screen you can change the action for different devices and types of media.
Hint: This is particularly interesting if you ever want to RIP a CD or DVD and Windows Media Player pops up to play the media. Turning the setting off for this media will keep it from popping up or auto-playing.
Turn off AutoPlay completely
Open AutoPlay by clicking the Start button , clicking Control Panel, clicking Hardware and Sound, and then clicking AutoPlay.
Clear the Use AutoPlay for all media and devices check box, and then click Save.
Turn off AutoPlay for only one type of media
Open AutoPlay by clicking the Start button , clicking Control Panel, clicking Hardware and Sound, and then clicking AutoPlay.
In the list next to each type of media that you dont want to be asked about, select Take no action, and then click Save.