Cannot log in to CompanyWeb or Sharepoint Central Administration

I have a new install of SBS2003, single server,, two client computers attached at this point for testing purposes before adding the remaining ones.  Both client computers were set up using ConnectComputer, and connected successfully.

 I am logged into the server as the Administrator, using the Builtin Administrator account.  Each time I try to open Sharepoint Central Administration or CompanyWeb, I get a login screen which will not accept my administratoruser ID or  password, or other user credentials.  After 3 tries I get an error page.  I have followed the KB 829114 for un-installing Sharepoint 2.0, and then re-installing, but still have the same problem.  I have used the format Username, server\username, and username@server, all which only return the login screen.

All Windows updates have been installed using Window Update repeatedly.
I have 2 NIC connections, one with direct connection to broadband modem (no router), and can access internet fine from server and client computers.

Prior to posting this question, I have done the following:  
Checked the Permissions under IIS/Web sites/Companyweb and Sharepoint as well as IIS and Sharepoint Security permissions all show the Administrator account with full privileges, as is the user account used from client computer that is part of the Administrators group.
I have re-run CEICW.
Companyweb has been added to Intranet trusted sites.

I do note that under Web Sites in IIS there are only 3 default web sites, not 4 as described by Jeff in his postings here on EE:  The Microsoft Sharepoint Administration site is missing.  Default, Com;anyWeb, and Sharepoint administration are listed.

Thanks for your help.
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I do not have specific advice to solve your problem, but I would say that if you are not too invested into it (time wise) and you only have the two computer connected then you may be better off just re-installing SBS on the machine in question and rejoining your test computers.

Hopefully someone else can chime in and give you a resolution, but something has clearly gone wrong during  your install process and I personally would wipe it clean and start over.

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