The boot prompt system can't log you in. Please make sure your username and domain are correct. What should I do?

When booting up: The system can't log you in. Please make sure your username and domain are correct.
If it is an XP machine. 1:Run->Enter“control userpasswords2”- >Select “To use this machine, the user must enter the username and password> 2: Run - enter regedit Expand to [HKEY_LOCAL_MACHINE\\\\ SOFTWARE\\\\Microsoft\\\\Windows NT\\\\CurrentVersion\\\\Winlogon] Delete AutoAdminLogon item&ldquo ; Start & rdquo; menu -- run & rdquo;, enter “ rundll32.exe netplwiz.dll, UsersRunDll & rdquo;, point to determine (note the case, follow the strict input above, or copy the past) and then pop up “ The advanced user configuration & rdquo; window, the user must enter the user name and password check & rdquo; remove (no tick, click the check and then cancel), click the application and then enter the correct username and password, click OK, finally restart the computer Yes.
When booting, it is displayed that the system cannot log you in. Please make sure your username and domain name are correct, and then enter the password. The letter of the password must be in the correct case. This is how it works (but after clicking OK) Enter the password to enter the normal operation of the system)??
Note: My computer has a power-on password, but after the password is cancelled, the above prompt will not be able to boot normally.
Solution:
If it is a Win XP system and a Windows Server 2003 system, please use one of the following methods:
Method 1: Run --> Enter “control userpasswords2”-> On the “To use this machine, the user must enter the username and password”
Method 2: Run-->Enter“regedit”
Expand to [HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon ]
Delete the “AutoAdminLogon” item, or change the value of this to “0” is also possible.
If you can't log in to the system, please enter " Administration" in the location of the user name in your login window. The password is empty, then you can see the computer desktop directly by pressing Enter! ! “Administration>;“A” is capitalized! !
Then go back to the steps above!