How to break window xp password "STUDY PURPOSE ONLY"

==> When your start your P.c you see a login screen like

==> I waana tell u that win xp have a built-in "Administrator"
 account that can be use without any password.

==>when you are on the login screen then you just simply press 
ctrl + alt + del key twice and you will reach on Administrator 
loginscreen like.

==>now just type Administrator on user name and just leave 
the password blank or empty & click ok.

congratulations you are successful logged as administrator...