Try checking your firewall settings. Is the firewall off, or if it is on, is there an exception for Remote Desktop?
Also, right-click on My Computer, Properties, and see that the box enabling remote desktop is enabled. There’s probably a tab that says Remote or something. It wouldn’t hurt to load the real SP3, too. I don’t know if the error you’re seeing is related to the remote desktop failure.
Check this :
Hope this helps.