turn remote desktop on:
cscript scregedit.wsf /ar 0
If you want xp workstations that don't have the vista rdp client (v6) to be able to connect, then you need:
cscript scregedit.wsg /cs 0
Clear as mud, eh?
Something went through both of my brain cells today. And to keep a long story short, it centers on your approach to the question – whatever ...