If yes, you can sign in the computer through another admin account and easily reset the lost Windows 8 password. Of course, this will be useless if you created only your present lost Windows 8 login password. Just skip this part.
Did I Create a Picture Password or PIN in Windows 8?
If so, try them after the Windows 8 administrator password says incorrect. If not, jump to the next step.
You are not at your wits' end right now. It's time for you to resort to third-party software-Lost Windows 8 Password recovery(Windows Password Recovery Tool). It has gained great popularity among most computer users. It's able to recover lost Windows 8 administrator password/lost Windows 8 user password for both local account and Microsoft account. It's easy to operate with only 3 simple steps:
Step 1: Download and Install Lost Windows 8 Password Recovery.
Step 2: Burn lost Windows 8 password Recovery CD/USB flash drive with Quick Recovery or Advanced Recovery Wizard.
Step 3: Insert the newly burned CD/USB flash drive into your locked computer. To reboot your PC from this bootable disk, you need to set BIOS. If your computer is preinstalled with Windows 8 and use UEFI, you have to disable UEFI Secure Boot before the BIOS setting.
Step 4: When this software screen appears, select your Windows sytem, choose the account for which you'd like to reset password, and reset it.
With the help of this software, you can recover your lost Windows password for Windows8/7/Vista/XP, etc.