I found this in a few different places around the 'net - hopefully it's helpful:

Change the Logon Window and the Shutdown Preferences in Windows XP

Setup configures Windows XP to use the friendly Welcome logon screen and the shutdown buttons, if your computer is installed as a home computer (a computer where a network domain has not been specified).

This article describes how you can enable the classic logon screen used by Windows XP Server that resembles the following example:

Log On to Windows
User name: _____________
Password: _____________

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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Short summary and practical fixes based on the thread (does not repeat the Control Panel steps already posted by ).

Common causes for the logon/shutdown options to be greyed out: a Novell/NetWare client installed (Client Services for NetWare), a third‑party GINA (custom logon DLL), or a Group Policy set by a domain. If the “Client Services for NetWare” message appears (as noted), the Welcome screen and Fast User Switching are intentionally disabled by that client — restoring the friendly Welcome UI normally requires removing the NetWare/Novell client from the system or from the network adapter properties. (learn.microsoft.com)

Troubleshooting checklist (quick, ordered):

  1. Confirm whether the PC is joined to a domain (domain membership will force the classic logon). (flylib.com)
  2. Check each network adapter (ncpa.cpl) -> Properties -> Networking tab for “Client Services for NetWare” / Novell client and uninstall it only if the workstation no longer needs Novell access. (pcrepairmansblog.com)
  3. If a third‑party GINA (examples: csgina.dll variants) was installed by some software, that DLL can disable Welcome/Fast User Switching — identify a custom GINA via the Winlogon\GinaDLL value and remove/replace it only after confirming compatibility. (learn.microsoft.com)

If policy or a persistent setting must be used: Group Policy can force the classic logon (Computer Configuration → Administrative Templates → System → Logon → “Always use classic logon”), which takes precedence over the User Accounts UI. For a local registry override (standalone machines), the logon mode is controlled by the LogonType DWORD under Winlogon; values set classic vs. Welcome as shown below. Back up the registry and create a restore point before changing anything. (flylib.com)

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
  LogonType (DWORD) = 0  -> Classic logon
  LogonType (DWORD) = 1  -> Welcome screen

Notes and cautions: removing NetWare/Novell components prevents access to Novell resources unless an alternative client remains; editing the registry or replacing GINA is risky — always export affected keys and verify domain/GPO requirements before making changes.

* 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.

Does not work for me as they are greyed out

What word goes into DWORD in the registry?
For XP?

Require users to press CTRL+ALT+DEL before the classic logon screen appears
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

If you want users to have to press CTRL+ALT+DEL before the classic logon appears like a Windows XP-based computer that is joined to a domain, follow these steps:
1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Click the Winlogon subkey at the following registry location:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
3. Click Edit, click New, and then click DWORD value.
4. To change the value name, type DisableCAD, and then press ENTER.
5. Keep the data value set to 0. The data value set appears as 0x00000000(0).
Warning .. Require users to press CTRL+ALT+DEL before the classic logon screen appears

Dont want that .. want to change back to classic

i went upto change the way users login logoff(for changing to windows screen) but when i enter there it shows
client services for netware has disabled these options

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