One way to make the problem go away would be to set the option "Interactive logon: Do not require CTRL+ALT+DEL."
From the Local Group Policy Editor description:
This security setting determines whether pressing CTRL+ALT+DEL is
required before a user can log on.
If this policy is enabled on a computer, a user is not required to
press CTRL+ALT+DEL to log on. Not having to press CTRL+ALT+DEL leaves
users susceptible to attacks that attempt to intercept the users'
passwords. Requiring CTRL+ALT+DEL before users log on ensures that
users are communicating by means of a trusted path when entering their
If this policy is disabled, any user is required to press CTRL+ALT+DEL
before logging on to Windows (unless they are using a smart card for
Default on domain-computers: Disabled. Default on stand-alone
To enable this, run GPEDIT.MSC. Under Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options, find "Interactive logon: Do not require CTRL+ALT+DEL." Set the value to "Enabled" and the logon screen will display the user/password prompt without needing CTRL+ALT+DEL.
Alternatively, using your favorite NOTEPAD-like editor, create a file called DisableCAD.reg (or something similar) and place in it:
Windows Registry Editor Version 5.00
Once you have the file, you can "run" it by just double-clicking on it. You will be prompted to apply the change to your registry. Answer yes and (possibly after a reboot) no more CTRL+ALT+DEL problem.
You can always set it back by changing the "1" to a "0" and reapplying it to the registry.