If you see that on the logon screen that's not the standard logon screen.
I've seen that for one of two Windows 2000 installations but never for an XP installation, although there was one guy who said he had that for his logon screen in XP a few days ago, and that was the first time I'd heard of that for XP.
In Win 95 through 98SE, probably ME, you could select from several possible Windows logon methods in Control Panel - Network - each one produced a different logon screen - but I have no idea how you get a different logon screen like yours in 2000 or XP. .
If you see that on the logon screen, if it's the same as the logon screen I saw for 2000, as I vaguely recall....
- you see a line on the logon screen "Press Ctrl-Alt-Del to....
- you must enter Ctrl-Alt-Del (hold down two of the keys then press the third one, then let go of all three) before you type a password
- there is probably one user name in a box - if the password for the user name in the box doesn't work and you know other passwords for other users, click on the box to select other possible users from the drop down list so it's in the box instead, then type the password for a user you have the password for.
(If there is no user name in the box, click on it to see the drop down list of users and select one.)
The password is case sensitive.
You must make sure that the case of any letters in the password is correct - upper or lower case. Caps lock may need to be toggled either on (the led on the keyboard for it is on) or off when you type the password.
You may need to Restart the computer after several unsuccessful attempts, e.g. three, in order to be able to have more trys for the password.
If you Do have a logon screen where you must enter Ctrl-Alt-Del before you type a password, it sounds so far like you're not familiar with how to use that logon screen, and that's suspicious.
When you have a standard (default) logon screen, the built in Administrator user (spelled exactly that way) is NEVER listed on the logon screen when you boot normaly - it's only listed when you load Windows Safe mode or Safe mode with networking (mode) - UNLESS there are NO other users that have administrator priviliges (are designated a Computer Administrator) .
I don't recall whether it's listed (Administrator - spelled exactly that way) when you boot normally when you have the login screen I saw for 2000 where you have to enter Ctrl-Alt-Del before you can actually logon, but I doubt that it would be.