Sorry, this text got lost in the post some how. Explains how I did it...

FYI, I was able to access C$ with Vista RC1. You have change some default
settings like enabling Network Discovery and create a password for the
user named "Administrator", then use the username Administrator and the
password you set for it as the login when you access the machine remotely.
So far I haven't been able to log in remotely using the username/password
that I created during the install. But just so everyone knows, you can
access the C$ share. If that went away, it would upset about a million IT
people, hopefully including yourself.

Hello,

You can also allow access to the administrative shares by any local
administrator by creating a registry entry.

Create or modify the following registry value:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Pol icies\system\LocalAccountTokenFilterPolicy

This is a DWORD value. Set it to 1.


--
- JB

Windows Vista Support Faq
http://www.jimmah.com/vista/