All computers on LAN running either Windows XP SP3 or Windows 7 SP. All of them have remote desktop turned on and all of them work except for one. It's a Windows XP Prof, when I try to connect from outside the LAN or when I'm on the LAN it acts like it's going to connect but then it gives you a message I keep getting this message "the problem can occur if the computer is running a version of Windows that is earlier than Windows Vista, or if the remote computer is not configured to support server authentication"
It has nothing to do with Vista. I have a SBS2003 on this LAN, none of my other PCs have this problem. I did install teamviewer and I got that to work. I uninstalled teamviewer.
here are other things that I have tried already none worked: