Did you go through the steps necessary to enable remote desktop on the windows 2008R2 system? I'd follow the directions here: http://technet.microsoft.com/en-us/library/cc794832(v=ws.10).aspx
accounts and group memberships at Local and Domain Default Groups (http://go.microsoft.com/fwlink/?LinkId=83477).
excerpt from the above URL:
To enable Remote Desktop locally by using Server Manager Open Server
To open Server Manager, click Start, point to Administrative
Tools, and then click Server Manager.
In Computer Information, click Configure Remote Desktop.
In the System Properties dialog box, under Remote Desktop, click one
of the following options:
Allow connections from computers running any version of Remote Desktop
(less secure). Use this option if you do not know the version of
Remote Desktop Connection that will be used to connect to this server.
Allow connections only from computers running Remote Desktop with
Network Level Authentication (more secure). Use this option if you
know that the users who will connect to this server are running
Windows Vista or Windows Server 2008.
Review the information in the Remote Desktop dialog box, and then
click OK twice.
There are more thorough instructions here : http://www.techotopia.com/index.php/Configuring_Windows_Server_2008_Remote_Desktop_Administration.