Windows XP users sometimes encounter the error below when trying to make an RDP connection to a server or computer. The solution is below:

Resolution:

To work around this problem, follow these steps.

Click Start –> Run

Type regedit and press Enter

Browse to the following registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\MSLicensing

Delete the entire MSLicensing folder and close registry editor.

Problem solved.