i want to know admins password, in which admin is only the user in that pc, i want to know the password, when it is logged in, without making any changes to that user account.
This is not possible.
Windows does not store login passwords in the system. Only a hash of the password is stored and it is this that is compared when logging in. This is for security reasons.
Get the SAM database and decode it. 1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.
Why do you want to know this? Please come back and let us know the outcome.
Fat hope of getting an answer to that one!