Hi George,
Check for Windows.old, and if it exists you can recover the original
installation:
http://support.microsoft.com/kb/933168
If you are familiar with tools like BartPE, you may be able to load the
system registry hive and check the logon entries, there most likely is
damage or invalid data under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Winlogon
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
http://mvp.support.microsoft.com/
Windows help -
www.rickrogers.org
My thoughts
http://rick-mvp.blogspot.com
"George Hayes" <George
> wrote in message
news:8763592C-40A0-4D11-A519-...
>I upgraded my XP (Sp2 with all updates) to Vista Ultimate. When finished,
>it
> presented me with two user logins which were present in XP and in
> Administrators. When I log into these, it accepts the password (if I use
> an
> invalid pw it tells me) and shows me the friendly Welcome message. The
> login
> fails and Welcome turns into Logging Off...
>
> Booting from dvd and going to recovery command prompt, I check the user
> repository with the NET commands. It lists only Administrator and Guest as
> available logins. The two users presented at login are not there. I use
> NET
> User /ADD and NET LocalGroups /ADD to create a new user and add to Users
> and
> Administrators. When I restart, the same original logins are presented,
> the
> new user is not present and when I reboot to the recovery command prompt,
> none of the changes or additions I previously made are present and only
> Administrator and Guest are showing as users. There were 4 users and
> various
> system accounts like ASPNET, IUSR_etc and IWAM_etc in XP. They are all
> gone!!
>
> Clearly something is very wrong here. How can I force a login as
> Administrator? I have been left with an entirely unaccessable system. It
> also
> cannot be rolled back, as the upgrade process didn't see fit to keep a
> copy
> of my previous os.
>
> What now?
> Thanks,
> George