Source - http://gecko.gc.maricopa.edu/~medgar/WinXPClassicLogon.html
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How to change the classic logon screen on Windows XP to use any fonts, colors, wallpaper, background, screen saver, et cetera.
These instructions can easily be generalized to change the logon screen for any desired theme.
HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\ThemeManagerDllName value to %SystemRoot%\Resources\themes\Windows Classic.themeHKEY_USERS\.DEFAULT\Control Panel key (optional) HKEY_USERS\.DEFAULT\Control PanelHKEY_CURRENT_USER\Control Panel key HKEY_CURRENT_USER\Control Panel[HKEY_CURRENT_USER with [HKEY_USERS\.DEFAULT