You will have to click the Start sphere, then enter "cmd"
in the search box. In the Command Prompt window write "control
userpasswords2" and hit enter.
Windows Vista will now ask you to elevate the privileges of the
process so do it and you will be face to face with a window for
User Accounts. Toward the top you will be able to see the option
"users must enter a username and password to use this computer."
Select the account you wish to alter and then check the
option.
actually i think my friend used the command prompt window to
remove the password leh... hm anyway the situation is like this, i
keyed in the user account password into the laptop. while in my
user account, i lent my friend my laptop and my friend did
something to it and removed the password. as long as my friend is
in my user account already (since im the one that keyed in the
password to let him into my account), he can just changed/removed
the user account password easily. so can this method really prevent
him from doing so? erm, i hope im making sense here. oops.