=== Prevent another user from logging in while computer is locked ===

Open **gpedit.msc** from either the Run prompt or from the Search box.

Under Local Computer Policy, go to ''<fc #6495ed>Computer Configuration</fc>'' → ''<fc #6495ed>Administrative Templates</fc>'' → ''<fc #6495ed>System</fc>'' → ''<fc #6495ed>Logon</fc>''

Select the entry that says: ''<fc #6495ed>Hide entry points for Fast User Switching</fc>'': **Enable**