That happened to me and none of the fixes I found here or through other sites worked. The only way I got the autorun feature activated was to uninstall the DVD/CD drive from the device manager and reboot the computer. Once the drive was reinstalled by Windows, the autorun worked just fine.
Operating System Is XP Pro--I have both DVD & CD Units in my computer. Neither devices will play when I insert a disk. I have to open the CD/DVD with the "START-RUN-BROWSE-EXE." to run the programs. I have been unable to find the AUTO RUN feature of this program