Read http://www.winforums.com/showpost.php?p=46976&postcount=9 about the old disk detector and how they solved their issue.
In closing it's normal for Windows to do this to AudioCDs under the right conditions.
Track01.cda, track02.cda, etc.
Autoplay on Music CDs is turned off for audio CDs.
This started happening at work as well, when I had to replace my drive.