TRICK ONE:-
1) Create shortcut kat desktop
2) ENTER 'rundll32.exe user32.dll,LockWorkStation' kat location field
3) NAMAKAN shortcut tu apa2 je yg korang nak contohnye ABC
4) JUZ double click kat shortcut tu
5) NOW, ur computer will be instantly LOCKED!
TRICK TWO:-
1) The Windows key + L also does the same thing
AND THEN TO UNLOCK CLICK ON UR ACCOUNT NAME.....