How does one log on to WINXP using administrator? What should I do if I fail to see the Administrator when switching users?

Generally, the administrator user name is not displayed. If you want to log on as an administrator, you can change the user logon and logout methods on the control panel-User Account->, in this mode, the check box at the front of the welcome screen is canceled. When you log on to the system, the traditional Win2000 logon mode appears, you can manually enter the administrator user name to log on to the system.
In addition, if you do not change the logon mode, the system will also display the administrator user name in near-secure mode.