Solution 1: Take a Freeware Password Recovery Tool
Step 1： Locate a password recovery program for Windows 7, such as Ophcrack, Windows Key or Cain & Abel (see Resources). Click the "Download" link next to the program, then click "Save File" in the dialog box.
Step 2：Open the program by clicking the program icon on your desktop, then clicking "Install." Launch the program when installation is complete.
Step 3：Select your Windows 7 user name in the menu and click "Recover." Wait while the program attempts to find a matching pair for your password.
Solution 2: Use a Windows 7 Installation Disc for Recovery
Step 1：Place the Windows 7 installation disc into the computer's CD/DVD drive.
Step 2：Click the "Repair Your Computer" option. Select a language and then click "Next."
Step 3：Click the "Command Prompt" and type "net user<user account>." Replace "user account" with your name. Press "Enter."
Step 4：Type in a new password and press "Enter" once to save the password and one more time to confirm the choice. You can now log on to Windows 7 with your user name and new password]
Solution 3: Windows 7 Password Reset with a Third Party Shareware
You can still reset the lost Windows 7 password with a third party software to solve the problem of Windows 7 password reset. As I know, W indows Password Unlocker is a powerful and efficient tool which I sucessfully hacked my forgotten password on Windows 7. It just took me several minutes to create a password disk with a bootable CD/DVD/USB and after resetting, I can log on the laptop with a blank password allowed. It is amazing and less time-consuming.
1. Download and install Windows Password Unlocker Professional
2. Burn a bootable CD/DVD or USB to remove lost Windows password.
3. Set your target computer to boot from CDROM or USB flash drive
4. Insert the burned CD/DVD or USB flash drive into the locked computer and reset it quickly.