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Use the Classic Logon Screen
To temporarily use the classic logon screen, press CTRL+ALT+DEL twice on the Welcome logon screen.
To configure Windows XP to use the classic logon and shutdown screens for every logon session, do the following:
Click Start , and then click Control Panel .
Double-click User Accounts .
Click Change the way users log on or off .
Click to clear the Use the Welcome screen check box.
NOTE : If you disable the Welcome logon screen, you also disable the Fast User Switching option.
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Require Users to Press CTRL+ALT+DEL Before the Classic Logon Screen Is Displayed
If you want to set up a requirement for a user to press CTRL+ALT+DEL before the classic logon is displayed, in the same manner as it behaves on Windows XP Server:
Click Start , click Run , type: regedit , and then click OK .
Select the Winlogon subkey at the following registry location:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
Click Edit , click New , and then click DWORD value .
Change the value name to "DisableCAD" (without the quotes) and press ENTER.
Keep the data value set to 0 which is displayed as 0x00000000(0).