There are two methods can solve this problem:
* Method 1. Unlock Windows lost password in safe mode
* Method 2. Unlock Windows lost password with a third-party program, use [http://www.windowspasswordkey.com/|Windows Password Key] to create a Windows password reset disk to unlock the locked pc.
You can follow the detailed guide of "[http://www.windowspasswordkey.com/locked-out-of-windows-pc-what-to-do/|Locked out of Windows PC, What to Do?]" to help you.