Hi Julie
To begin with, autorun is "iffy" at best. There are just so many factors that come into play.
But from past experience a few versions back, here are a few things that I would double check:
* What works best is to use EXE format. If you are using HTML/SWF things likely will fail.
* Ensure the EXE file name has no spaces. Use CamelCase or Under_Scores to accomplish that
* Ensure the EXE file name adheres to the older DOS 8.3 format. SomeFile.EXE and not SomeWonderfulAndBeautifulFile.EXE
Hopefully this helps... Rick 
