Cannot Admin Vista RC1 after being on Domain

[Guest]

I Installed RC1, with one user account. The account was OK installing
software, and making changes to the system. After all of my software was
installed, I joined the machine to a domain. As a domain admin, I was able to
join to the domain with my domain admin account. All was well. When I wanted
to make changes, it prompted me for my domain admin account, which at the
time was not an issue. When I decided to take the machine off the domain, it
made my original account that was created on install a guest account with no
privileges. Now I am in a security box. I cannot install programs; I cannot
make any changes to the system. I cannot join back to the domain, because UAC
is asking for an admin name to make changes to the machine, but not giving me
the option to type an admin name to make changes, possibly because there is
no admin account on the machine. Any thoughts from anyone

 

[Mark D. VandenBerg]

I Installed RC1, with one user account. The account was OK installing
software, and making changes to the system. After all of my software was
installed, I joined the machine to a domain. As a domain admin, I was able
to
join to the domain with my domain admin account. All was well. When I
wanted
to make changes, it prompted me for my domain admin account, which at the
time was not an issue. When I decided to take the machine off the domain,
it
made my original account that was created on install a guest account with
no
privileges. Now I am in a security box. I cannot install programs; I
cannot
make any changes to the system. I cannot join back to the domain, because
UAC
is asking for an admin name to make changes to the machine, but not giving
me
the option to type an admin name to make changes, possibly because there
is
no admin account on the machine. Any thoughts from anyone

You could boot Vista into Safe Mode and create a new user with elevated
privileges.

 

[Kerry Brown]

If there are no administrator accounts then you should be able to logon in
safe mode as administrator with no password and create another administrator
account. Normally the administrator account is disabled but I think if you
accidently delete all the other administrator accounts then it is enabled in
safe mode.