Guys,
Generally People set the password to the user account which they are using and they think that their PC is safe

...But Actually, There is a way to log in to their PC....
Here is the Trick.
After Starting Up a PC, You will see that windows is asking for the Password.(If that PC is Password Protected)
So all you have to do is
Press Ctrl+Alt+Del
Now,
You will able to see Username and Password Tabs
So Type,
"Administrator" in the "Username" Tab
and Press enter.
DONE

& YOU ARE READY USE THAT PC

!!!!!
HAVE FUN.....
P.S.
This trick I did on Windows XP only so I am not sure about any other operating systems.
P.P.S
You can use this trick only until the user doesn't set the PASSWORD to ADMINISTRATOR account.
P.P.P.S
Even you can protect your PC by using this Trick.