There are probably other ways to do this as well.
You can do this with the secpol tool or the Windows Security Policy Editor.
In runbox type "secpol.msc" and lose the quotes or click start, Control
Panel, System Maintenance, Administrative Tools, local Security
Policy>continue with the UAC prompt>
In the Local Security Policy editor you will see two panes, one on the left
with tree-view navigation and one on the right which will have the actual
definitions and items to edit. On the left hand side, expand (either by
clicking on the arrow or double clicking) the "Local Policies" section, and
then click on "Security Options". On the right hand side, scroll down until
you see "Interactive logon: Do not display last user name". Double click on
this entry and you will be presented with a dialog box that has two
options - "Enabled" and "Disabled", with Disabled being selected as default.
Change this setting to "Enabled", and then click on the OK button.
After double clicking “Interactive logon: Do not require CTRL+ALT+DEL”
select the Disable option and hit OK. Next, close the Local Security Policy
editor, as you are done. Log off. When you are prompted by a request to
press CTRL-ALT-DEL do so, and you will get the classic style logon screen.
or
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).
Good luck,
CH