Have you seen this KnowledgeBase article: Running a LabVIEW Application as a Windows NT/2000/XP/Server 2008/7 User-Defined Service
It may have the steps you need for creating a Windows Service.
Have you seen this KnowledgeBase article: Running a LabVIEW Application as a Windows NT/2000/XP/Server 2008/7 User-Defined Service
It may have the steps you need for creating a Windows Service.