Steve McDonald had some issues with Vista as well. Here is the link to his solution and why it worked.
http://tech.groups.yahoo.com/group/U...r/message/4709
A couple of people have the space issue with XP as I recall, but Tarlanon and I have not and could not recreate the problem in XP... As I recall, in all cases, they were putting DC somewhere other than the C drive and we solved the problem by writing "progra~1" instead of "program files". On my computers, it does not seem to matter what the drive letter is, they work fine.