if you didn't have a usb reset disk, don't worry.
way 1: You can easily reset your login password with safe mode.
Windows OS has a default administrator account created during Windows installation. By default, the built-in administrator account is named Administrator and has no password in it. But Windows 7 usually has this account disable, you need to enable the account before. If forgot Windows 7 password, try to follow this tip.
Step 1: Start your computer and press "F8" while the computer boots up. The Advanced Boot Options screen appears.
Step 2. Scroll down to "Safe Mode" and press "Enter." Your computer starts in Safe Mode.
Step 3. Click on the "Administrator" account that appears on the Windows logon screen. After entering system, click on "Start" and “Control Panel" to change your other account password.
way 2. try some windows password reset tool like ntpassword, ophcrack, passmoz or wingeeker. but you need to prepare an usb and another working computer to make a reset disk.
https://support.microsoft.com/zh-cn/...-passwords-faq
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http://ophcrack.sourceforge.net/download.php