Exchange 2007 Setup

The Exchange 2007 setup is an annoying process. I've done a couple now and they all seem to generate the strangest errors. I'm getting a couple of fun ones:

When running setup.com /PrepareAD:

Welcome to Microsoft Exchange Server 2007 Unattended Setup
Preparing Exchange Setup
No server roles will be installed
Performing Microsoft Exchange Server Prerequisite Check
Organization Checks ......................... COMPLETED
Configuring Microsoft Exchange Server
Organization Preparation ......................... FAILED Active Directory operation failed on sabeydata.Sabeyco.com. The object 'CN=All Contacts,CN=All Address Lists,CN=Address Lists Container,CN=Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=Domain,DC=com' alreadyexists.

I got pointed to one possible lead http://support.microsoft.com/kb/936907 that looked promising but didn't pan out.

The system log has an error similar to this from http://support.microsoft.com/kb/555854/en-us

The following error may appear in the event log:
Event Type: Error Event Source: MSExchange ADAccess Event Category: Devices Event ID: 2152

Description: The following information is part of the event: ExSetupUI.exe; 4912; 1753; Error 6d9 from HrGetServersForRole

This error may occur due network adapter binding error issue or/and disable File and Print sharing on the network adapter.

That still didn't get me anywhere...