Many input methods are displayed in the upper right corner of Windows boot.

First, right-click and choose settings in the lower right corner of the taskbar to delete the Redundant Input Methods, leaving only useful ones. As shown in:

In Windows 7, you can also click "Copy settings..." on the "manage" tab of the "region and language" dialog box ..." Button. The "Welcome Screen and new user account settings" dialog box appears, select "Welcome Screen and System Account" at the bottom to copy the default input method, location, and language configuration of the current user to the logon interface. In addition, if you select "create user account", the default input method of the new user (or new login) is the same as that of the current user. As shown in:

After confirmation, you can log out and see that only one default input method is displayed.

Therefore, the Administrator only needs to use the Administrator account to log on to the Windows 7 computer and specify the default input method, copy the settings to the "Welcome screen" and "New User Account" to modify the Default Input Method on the Windows 7 logon interface.