Forgetting your Windows 7 password can be frustrating, but there is a way to reset it using Command Prompt. Follow these steps to reset your password:

1. Boot your computer from a Windows 7 installation or system repair disc.
2. Choose your language preferences and click 'Next.'
3. Click on 'Repair your computer.'
4. Select the Windows installation you want to repair and click 'Next.'
5. Open Command Prompt.
6. Type the following command: copy c:\windows\system32\sethc.exe c:\
7. Then, type: copy c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe
8. Restart your computer.
9. At the login screen, press the 'Shift' key five times to open Command Prompt.
10. Now you can reset your password by typing: net user username newpassword
11. Close Command Prompt and log in using your new password.

It's important to note that this method should only be used on your own computer to reset a forgotten password. Always ensure you have the necessary permissions to perform this action.