How to "Delete administrator Password" without any software

Method 1

Boot up with DOS and delete the sam.exe and sam.log files from Windows\system32\config in your hard drive. Now when you boot up in NT the password on your built-in administrator account which will be blank (i.e No password). This solution works only if your hard drive is FAT kind. 

Method 2

Step 1: Put your hard disk of your computer in any other pc.

Step 2: Boot that computer and use your hard disk as a secondary hard disk (D'nt boot as primary hard disk ).

Step 3: Then open that drive in which the victim’s window(or your window) is installed.

Step 4: Go to location windows->system32->config

Step 5: And delete SAM.exe and SAM.log 

Step 6: Now remove hard disk and put in your computer.

Step 7: And boot your computer :-)