For added security, you can turn off the Welcome screen and Fast User Switching. This requires users to use the classic logon prompt and to type a user account name . If you are using a domain network, you can require users to use Ctrl+Alt+Delete, which protects your computer from automatic logins. The steps to change the way Windows starts differ , depending on whether your computer is part of a network domain or shared/workgroup computer.
Change the Way Users Logon and Logoff
Increase Logon Security on a Domain Network