Caution: Resetting a password using these methods means you will lose access to any encrypted files utilizing the Encrypting File System (EFS) built into Windows and stored passwords for Internet Explorer and network resources.
There are many other bootable password recovery and rescue tools that work with the latest Windows versions, but most require changing the boot settings of your computer.
If you have a genuine Windows 8 disc or flash drive, you should be able to boot from it without having to change the boot settings. If this is the case, you can use it to perform a so called "Sticky Keys" hack to reset your local Windows account password.
A previous article describes how to perform the Sticky Keys hack. The article was written for Windows 7 and earlier, but still applies to Windows 8 and later with a few caveats:
If you don't have a genuine Windows 8 disc or flash drive, you can use a third-party tool or utility. For example, the Offline NT Password and Registry Editor is included with other rescue discs like Hiren's BootCD.
Before you can boot up a third-party tool on a computer that came pre-loaded with Windows 8 or later, you must temporarily disable the new Secure Boot and UEFI features. Start by holding the Shift key down while you restart Windows 8, even from the initial login screen.
Once it boots into the Advanced Startup Options (ASO) menu click Troubleshoot, Advanced Options, and UEFI Firmware Settings. The exact settings differ between PC manufacturers, but find and disable the Secure Boot and UEFI features, which may include enabling the Compatibility Support Module (CSM) or legacy boot mode.
Once you run the bootable third-party tool and clear your Windows password, you should re-enable Secure Boot and UEFI. Then you should be able to boot into Windows again and login.
Prevent future forgotten password issues
Now that you're back onto your Windows account, consider setting some alternative login methods, like a PIN or picture password, which can be used if you forget your password.
If you're using a local Windows 8 account, you can create a password reset disk using a USB flash drive via the User Account settings in the Control Panel. If the password is ever forgotten, even if it has been changed since you made the reset disk, you can plug in the USB flash drive in order to reset your password.
A somewhat similar password reset function exists for Microsoft accounts. You can generate a Microsoft recovery code so that you can save it and enter it later if you forget your password, even if the password has been changed. You can generate this recovery code on the Microsoft security settings webpage.
Sign up for Computerworld eNewsletters.