To prevent this from happening, you should learn something to remove windows password as backup.

The original way is trying to guess your forgotten windows password. I think it is a stupid way but maybe it's the fastest one. If I meet the situation I will first think about my parent's birthday or my grandmother's birthday. Because I always set password like that. However, if unlucky for you, maybe you spend one days for nothing. So if you guess the wrong password for few minutes, give up the way to find another way to recover windows password.

If you have no Windows password recovery software  in advance, and you need to reset windows password in no time. Here I'm going to introduce the Anmosoft windows password reset professional.

Windows Password Reset Professional would be your first choice while forgot password Windows. This utility helps you save the time and effort, so that you could conquer the password recovery issue powerfully in minutes.

The password recovery will be finished without any data losing or file damaging with mouse-clicking and press keys as long as you follow the below 3 simple steps:
Step 1: Download Windows Password Reset Professional and run it
Step 2: Create a windows password cracker USB flash drive(This version can use cd/dvd or usb flash drive to create).
Step 3: Set BIOS to boot from USB flash drive.
Step 4: Get the lost or forgotten windows password recovery with the reset disk.

After 4 steps above, you could login your locked system without password. As the Windows Password Reset bypass windows password efficiently in minutes no matter how long or complexity the password used to be.