First log in to a user account which has admin priveleges.
Go to: Control Panel >> User Accounts
1) Click on the blue Manage another account.
2) Click on the blue Create a new account and provide a username & password (password is essential for privacy)
Repeat from step 2) for each new account that you wish to create.
It's essential that no user knows another user's account password.
All user accounts that are created will appear on the Windows log-in screen.