Here is a quick and simple way of enabling remote desktop on an Windows 7, Vista, XP, 2003 and 2008 machine remotely.
First off, if you are running local client firewalls the firewall rules needs to be changed to allow what we want!
Just connect to the remote machine with regedit (or use reg.exe from the command line if you want), browse to the following registry location:
Locate the fDenyTSConnections and set it to 0 ( or create it if it’s missing a DWORD entry).
Voila you are done! Now go access that machine or server via RDP!