I tried Uvnc X64 also but had no joy either. the problem seem to happen on all windows 7 and server 2008 devices.
both VNC's work fine on machines that dont need to be loged in.
I managed to get in to the server by importing the registry to another server and configuring it to auto login to a admin account.
Then remotely rebooted the Server. few minutes later I could gain access and continued to set it up from home.
Thanks again.