Restart Terminal Services Without Rebooting
Microsoft Windows 2003 and lower does not allow you start or stop the Terminal Services service. However if you can’t schedule a server reboot there is an alternative.
Download the Sysinternals tool Process Explorer
Using Process Explorer locate the
svchost.exe -k termsvcs process. There will be a number of running svchost.exe processes. Hover your mouse over them to identify the correct one. Once you find it, right click and kill it. The Terminal Services service will now be stopped.
Restart the service (no longer greyed out) and your good to go.