Break WIndows password with USB:
If you have a bootable CD/USB drive,some password tools can be burn to it and you can boot your computer from USB to run the software,so that you can recover/remove WIndows system password from USB.
Such as Windows Password Rescuer,here I just list the simple steps:
Step 1: Download Windows Password Rescuer
Step 2: Run it to burn to bootable CD/DVD or USB flash drive
Step 3: BIOS setting of your locked computer to boot form CD or USB
Step 4: Reset Windows password on a friendly window after Windows Password Rescuer starts.You also can use Windows Password Rescuer to add a new user with administrator privilege to your Windows without login. With this New user account you can logon your locked computer directly.