Now, many of you may be wondering, how to open someone's password protected computer, Without knowing his password?!!!!!!!!!!!!!!!!!

It's not a great task, You just have to do is:
Turn on the computer,
wait till XP asks you for your password
When prompted for a password, type: ctrl+Alt+del
A new screen pops up
In the Username Field type: Administrator
Leave the password field blank.
Press enter
And whoa!!!!!!!!!!!!!!!!! You are in.
( for education purpose only )