Workaround:
1. Right click on "My Computer", click "Properties", select the "Remote" button in the line menu above to see "Allow users to connect to this computer remotely" option is not ticked before.
2. Right click "My Computer", click "Manage", enter the Computer Management dialog box, click "Services and Applications", and then press "services" to see if the Terminal Services service is started, if the service is disabled, change to "manual" and then start the service.
3, through the Netstat-na command to see whether the 3389 port is started, there is no open, check that the port does not start, guess the service is not up.
4, from the window Server2008 this computer and then Remote Desktop Connection to this XP system computer.
Note: The Remote Desktop Connection XP machine, the XP machine must have the password to be able, if does not have to give the machine the user to set the password