It's there a way i can give the rights to a specific user, for restart a specific service on windows server 2008 ?
You can use the sc command to set permissions on a specific service.
The format is a little difficult to understand, but first you will need to find the user or group's SID to use the command (something like "S-1-5-21-....").
A couple notes on that command:
Replace myserver with your server's name and spooler with the service you want to edit.
More information is available at the following locations:
Waiting for my VMs to spin up, but it looks like this should work (from reading this)
I'll swing by after I've tried this out, but good question! I had no idea this had been added.