Cannot RDP to Domain Computers

I put this question here as I think the problem resides either in the "Active Directory Users and Computers" console or in Group Policy Somewhere.

For Some reason I no longer can Remote Desktop to any computer on the Domain using my either My Domain Username/Password or even the local Administrator on the computer itself. It used to work fine then one day it just stopped. This happened a while ago and I just never focused any energy into finding a solution. When I try to remote Desktop to a computer I get this error:

http://i146.photobucket.com/albums/r...c/RDPError.jpg

I am using a Vista Sp1 Computer and Trying to remote to another Vista SP1 computer, but I get the same message when trying to RDP from Vista to XP or XP to XP. In the Active Directory Users and Computers console my User is a member of the Remote Desktop Users group and I am also a domain admin. I looked up and down ADUC and did not see anything out of the ordinary.

This lead me to dig into the Group Policy Objects. There is a Domain Default Policy and in there under the security settings the Remote Desktop Users group and Domain Admins group are granted rights to use Terminal Services. The funny thing is I can RDP into any of my servers just fine so it only seems to be affecting Desktops. I have googled myself to death and tried many things that was said to be checked but I am stuck. The only thing I can think of is maybe that the GPO is corrupt or something. The next thing I am going to try is moving a workstation into the Servers OU since it seems I can RDP to any of the servers that are in that OU and there is a seperate GPO that grants rights to users/groups to use terminal services. But I thought I would see if I may be missing something before I try that.

Please help because I need my RDP rights back.