How to Delete your administrator password

Put your hard disk of your computer in any other pc

Boot that computer and use your hard disk as a secondary hard disk (Don't boot as primary hard disk)

Then open that drive in which the window is installed

Go to location windows----->system32----config

And delete SAM.exe and SAM.log 

Now remove hard disk and put in your computer, boot your computer

that's it, you have successfully removed the administrator password