I know very little about IIS.  I would suspect that the user running
IIS doesn't have execute permissions on swish-e.exe, though.  This
article on enabling exec() for PHP on IIS may help you:
  http://www.iis-aid.com/articles/trouble_shooting/warning_exec_function_exec_unable_to_fork

-- 
   David L Norris
   http://webaugur.com/
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