If you want to have the original NT style windows logon screen with XP,
simply hold the Ctrl-Alt keys and press the delete key twice.

To make a permanent change so the logon screen is always like the traditional NT4/2000 style:

1. Go to the Control Panel
2. Open up User Accounts
3. Click Change the way users log on and off
4. Uncheck Use the Welcome screen
5. Click on Apply Options