Error: The client could not connect to remote computer

Running OS 10.5.2 on a Mac Pro (Intel)<br>
<br>
Tried using old RDC and new Beta 2.0.0 Beta 2 (plus CoRD).<br>
I get an error: The client could not connect to remote computer.<br>
<br>
Either remote connections are not enabled, the maximum number of<br>
connections was exceeded, or a network error occurred.<br>
<br>
Try connecting again later or contact your administrator.<br>
Server at other end running Windows 2000.<br>
<br>
When I switch to Boot Camp and use Vista Business to log in - no<br>
problems.<br>
<br>
Am thinking of using Vista in Fusion to avoid having to do the dual<br>
boot thing.<br>
<br>
Any ideas?