To disable autoplay, go to "My Computer," right-click the drive you want, select "properties," and click on the "auto play" tab. Then use the pull-down menu to select the type of file (music files, music CD, etc), and then select "take no action," as opposed to having a program to automatically play/launch the file/disk. You'll have to do this with each type of file, as well as each drive you want to disable autoplay on.
Hope this helps,
I have Windows XP2 Pro--SP2. How do I turn off Auto Play