Answer:
Windows Vista does not require you to press Ctrl+Alt+Del to login to Windows. Something that has been a part of Windows for a long time (unless your PC is joined to a Windows Domain). You can enable this requirement to log into Windows Vista by doing the following:

1. Click on the Start button, type in netplwiz and press (or type it in the Run box).

2. Click the Advanced tab in the User Accounts window that opens.

3. In the Secure logon section at the bottom of the window, check the box next to
"Require users to press Ctrl+Alt+Delete".

4. Click OK.