disable reboot in windows server 2008 r2

hello

i an RDP use windows server 2008 r2
i have 5 administrator in this rdp
but i have a problem
some administrator is reboot the rdp becouse update or some software need a reboot to run
but when the rdp is reboot all my program and stuff stop running and i need it to be run 24/24

i remove reboot and shut down icon from start menus
and i disable automatique reboot when update are installed
But with this the rdp is still rebooting !
so i need a solution that any administator or user never can reboot the rdp .
thanx you

This can be done via Group Policy. You can permanently disable reboot through it. The reboot is working still because of privileges provided in gpo. I think you must first check the privileges provided to the admin accounts. One by one you can verify which account has access to reboot the system.