Step-by-step
- Download PC Login Now from pcloginnow.com
 
- The file is .iso format. You need to burn it to CD. You can use Nero, ImgBurn or any CD burning software.
 - Once,   you have burn the image on CD. It’s an bootable disc. Insert the CD  and  reboot the target system. When booting up the system, you must  select  to boot from the CD which you’ve just created.
 - If  you see the  screen like the figure below, the system is loading from  CD. But if the  Windows is booting up, you may need to restart and  configure your BIOS  to make the system boot from CD
 
Waiting for the CD is finishes loading up the system.
You’ll see this screen once it has finished loading up. Click next to continue
It shows all available system. But normally, you should has only one system. Select it and click next.
Next, it lists all local Windows accounts in the system. Select the account you want to reset the password. Then, check on “password is empty” and click next.
 Note: You  can select more than one account by hold CTRL  button and select the  accounts. Also, you can change other account’s  attributes  (enable/disabled, lock/unlock and password expire) by  check/uncheck the  boxes.
It asks you if you want to reset another user. Select No
Click OK to reboot the system. Don’t forget to remove your CD before reboot the system.
Now test with the account that I’ve just reset to empty
That’s it!. I have reset my administrator’s password to blank and it works. Easy and fast!.