Vista - Allow Log In Terminal Services

HI I am getting an error when I click connect in the RDP from Vista Ultimate
to Windows server 2003? as follows:-

"to log onto this remote computer your must be granted the allow log on
through terminal services right, by default members of the remote desktop
users group have this right. If you are not a member of the remote deskop
users group or another group that has this right, or if the remote desktop
users group does not have this right, you must be granted this right manually"

Is this something I am doing or does the server admin need to add me to
something? FYI I am a member of the rdc group as well?

Please help

PS I have tried removing Remote Desktop Users from Allow log terminal
services and putting it back but it is not there to put back now??? I have
spent hours searching this please help