I'm just trying to cope with a similar situation. I've been remote debugging
XP Home target machines from an XP Pro VisualStudio 2005 development machine,
for over a year. Now I'm trying to remote debug on a Vista Home target
machine and I'm running into non-stop headaches.
This post from a msdn forum contains info from some guys at microsoft.
Their last word on the subject was that you can only debug a Vista target
from a Vista dev machine. And you can't ever remote debug on Vista Home.
I'm still searching.