osvaldo, this one coming to you directly from Microsoft " Welcome to Microsoft Answers Community.
You cannot reset it directly as a reset way function. However, you can
remove that password and type a new one instead, by following the steps
here -> Restart your PC, and hold the F8 keyboard button and as You
enter the Windows® Boot Menu you will see some different choices,
choose Safe Mode with Networking. Now Windows® will start in Safe Mode.
Select the default Administrator account from the login, the password
can be blank. If you are lucky and passed the login, then you’re able to
edit your original account." I hope this will help you out. Good Luck.
To reset your Windows 7 password, you have many methods:
Tips one: Reset Windows 7 Password with Repair Disk
Just insert the repair disk to your computer and restart it. When the System Recovery Options dialog appears, select Startup Repair and follow the Repair Wizard. After successfully restoring, you may need to add back some programs and/or Windows Updates that may have been removed during the restore process, you may also need to reset any personal settings that may have been changed but none of your personal documents or files will be removed.
Tips two: Reset Windows 7 password with CMD
1. Logon you computer with another user account which has admin privileges.
2. Click Start, type in "CMD.EXE" in the search box, press Enter.
3. Cammand screen apears, type in "net user" "user name" " new password", press Enter. The user account password will be replace as the new one.
Tips three: Reset Windows 7 password with a Windows password recovery program.
This method requires you to load a Windows 7 password recovery program like SmartKey Windows Password Recovery.
1. Install the program on another computer and create a password recovery disk with USB
2. Insert the disk to your laptop and set your laptop to boot from it.
3. All user accounts will be loaded, then you can reset any user password.