1. Through User Accounts
Step 1. Log on to the accessible user account with administrator permissions.
Step 2. Press Windows +R to bring up the run box, then enter control userpasswords2 in the box and
press Enter.
Step 3. On the coming User Account Window, select your target account, and click Reset password button.
Step 4. Type and confirm the new password

2. Trough Local Groups and Accounts.
Step 1. Log on to the accessible user account with administrator permissions.
Step 2. Click Start and enter lusrmgr.msc into the Search box, press Enter.
Step 3. On the coming Local Users and Groups Window, expand Local Users and Groups, and expand Users.
Step 4. Right-click the account that you need to reset the password for, and then click Set Password.
Step 5. Type and confirm the new password.

Tip: You can also open the Local Groups and Accounts by right-clicking the Computer icon to select Manage.

Worth noting: If you need to reset Windows 7 administrator password because you've forgotten yours and can't get in to Windows then you obviously can't use the method described above. In that situation the best choice for you is to get an efficient third-party tool. Here I suggest you to try Windows Password Breaker, which is the best popular Windows password reset tool on market. You'll be able to create a Windows 7 password reset USB flash drive or CD/DVD in minutes to reset the forgotten password to blank instead of cracking it. It claims 100% password reset rate and 100% security without any computer data or settings loss or damage.

Requirements:
1. A PC to download and install the Windows password reset tool
2. USB flash drive or a blank CD/DVD and CD-ROM¡ÀRW drive

Guide:
1. Download and install Windows Password Breaker and then install or launch it.
2. Insert the blank CD/DVD or USB flash drive in your computer.
3. Burn a bootable password reset CD/DVD or USB flash drive.
4. Insert the CD/DVD or USB flash drive in the locked PC.
5. Start the computer, press the right key to enter BIOS setup and set BIOS to boot from CD/DVD or USB there.
6. Reset forgotten Windows 7 password to blank.
7. Log on to the computer without password after password reset.

Aside from Windows 7, Windows Password also works for Windows Vista and XP. It even allows you to reset local administrator, domain administrator, and other user account password in Windows server 2008(R2)/2003(R2)/2000. No matter how long and complicated your lost password is, no matter what your PC brand and mode are, Windows Password Breaker helps you reset forgotten login password to computer in a few minutes.