For some reason the autorun doesn't always(but randomly) kick in on this computer, might be AnyDVD or Daemon tools.. But it worked on my other computer.
I had done it right the first time, but it looks like I'm in the same situation as you: it doesn't work on my desktop but does work on my laptop (which is much 'cleaner' than the desktop). BTW, I also have dameon tools installed, so I tried uninstalling it but it didn't change a thing. I've also tried to use M$ autofix to repair the autoplay on the desktop but it ran into problems :
Test [Drive Notification] - Instance [I:\, Drive Type: 2]:
Result [Legacy Notification]: OK
Result [AutoPlay V2 Notification]: Problems {
Service (Fired)
Shell (Deaf) }
>> Repair << [Autoplay V2 Event]
Step: Deleting ShellHWDetection LaunchPermission (HKEY_CLASSES_ROOT\AppID\{B1B9CBB2-B198-47E2-8260-9FD629A2B2EC}!LaunchPermission)
Result: The wizard ran into problems while trying to delete this registry value (HKEY_CLASSES_ROOT\AppID\{B1B9CBB2-B198-47E2-8260-9FD629A2B2EC}!LaunchPermission).
>> Required action: The wizard found problems but cannot fix them -> None
This autoplay thing is such a pain in XP... I'm about to give up because I'm pretty sure that only a clean install of XP would fix it, as is often the case with this kind of issue.