You can give a password when windows starts. Nobody can hack this password.
When you are giving password then only it is going to login screen.
If you are giving wrong password three time windows will restart. So it is powerful password
1- click on start
2- click on run
3- type syskey
5- click on update
6- click on password startup
7- give a password
(dont forget the password,if password forget nobody can enter the system.)