If you are trying to unlock your account, download a LINUX Mint image and install it on either USB or CD. Follow these steps:
1) Mount your Windows partition (click on it on the desktop or in file explorer)
2) Open up a terminal:
2.1) type "sudo apt-get install chntpw" and follow instructions.
2.2) type "mount" and look through the output for something like: "/home/[name]/media/[Windows partition name]"
2.3) type "cd /home/[name]/media/[Windows partition name]/Windows/System32/config"
2.4) type "sudo chntpw"
2.5) Follow instructions