Enable Remote Desktop on Windows 2008 Server Core
For Windows 2008 , Server Core & Vista clients type:
Cscript %windir%\system32\SCRegEdit.wsf /ar 0
For Windows XP & Windows 2003 clients type:
cscript %windir%\system32\SCRegEdit.wsf /ar 0
cscript %windir%\system32\SCRegEdit.wsf /cs 0