WHEN WE USE OUR FRIEND's PC OR LAPTOPS try this......>>>>

HE MAKE A USER ACCOUNT PASSWORD N DONT TELL
US OK ITS FINE HE ONLY ALLOW US TO USE THE PC AFTER LOGIN
NOW THE TRICK IS
" ONE TIME U REQUEST HIM TO LOGIN THE ADMIN ACC. OR THE ACC. THAT HAV ADMIN POWER
NOW WHEN HE NOT THERE MAKE ANOTHER ACCOUNT HAVE ADMIN POWER

NOW LOG OF THE ACCOUNT OF UR FREN N LOGIN BY UR NEW ACCOUNT THEN
GO TO CONTROL PANEL OPEN UR FRENZ USER ACC. THERE'S AN OPTION OF REMOVING THE PASSWORD CLICK ON IT THAT NOT ASK U TO ENTER THE PASSWORD

NOW U AGAIN LOG OFF UR ACC. N LOGIN BY UR FRENZ ACC NOW GO TO CONTROL PANEL
N CREATE A NEW PASSWORD TO UR FRNZ ACC.
AT LAST U DELETE UR NEW ACCOUNT WHICH U MADE ABOVE"

NOW UR Friend IS UNABLE TO OPEN HIS ACC.
N HE NEVER KNOWZ HW U DONE IT

LATER U TELL HIM PASSWORD OR THE WHOLE TRICK

AS U WISH....

basically for Windows Xp...

try it....