How can I prevent users from tampering with, stopping or crashing a Windows Service that is doing work in the background that may take a while to complete?
try this http://social.technet.microsoft.com/Forums/en-US/2758d69a-60e8-4a5b-83dd-fc7d8e15bdc1/preventing-users-from-stopping-a-particular-service-with-a-gpo